Dermatitis and Eczema — MCQs

Q: A 22-year-old female presents with dry papules in the seborrheic areas, especially in the summer. Her father also has a history of similar lesions. What is the most probable diagnosis?

Darier's disease. ### Explanation **Correct Answer: C. Darier’s Disease** **Why it is correct:** Darier’s disease (Keratosis Follicularis) is an autosomal dominant genodermatosis caused by a mutation in the **ATP2A2 gene**, which encodes the **SERCA2 calcium pump**. This defect leads to a loss of cell-to-cell adhesion (acantholysis) and abnormal keratinization. * **Clinical Presentation:** It typically manifests as greasy, crusted, "dirty-looking" **malodorous papules** in a **seborrheic distribution** (chest, back, forehead, and scalp). * **Exacerbating Factors:** A classic hallmark is **photo-exacerbation**; lesions characteristically flare up during the **summer** due to heat, humidity, and UV exposure. The positive family history in this case further supports an inherited condition. **Why the other options are incorrect:** * **A. Pemphigus foliaceus:** While it involves acantholysis and affects seborrheic areas, it presents with superficial blisters and erosions rather than persistent keratotic papules, and it lacks a strong genetic/hereditary pattern. * **B. Keratosis pilaris:** Presents as "goose-flesh" papules on the extensor surfaces of arms and thighs. It is not typically found in seborrheic areas and does not flare specifically with summer heat. * **D. Seborrheic dermatitis:** Though it occurs in the same distribution, it presents as erythematous plaques with greasy yellow scales (dandruff-like) rather than discrete keratotic papules, and it usually improves or remains stable in summer rather than worsening. **High-Yield Clinical Pearls for NEET-PG:** * **Nail Findings:** Pathognomonic **"V-shaped" nicking** at the distal margin and longitudinal red/white bands. * **Mucosal Findings:** "Cobblestone" appearance of the oral mucosa. * **Histopathology:** Look for **"Corps ronds"** (in the stratum spinosum) and **"Grains"** (in the stratum corneum). * **Hand Findings:** Palmar pits and punctate keratosis.

Q: The UK refinement of Hannifin and Rajka criteria is used in the diagnosis of which condition?

Atopic dermatitis. **Explanation:** The **UK Refinement of the Hanifin and Rajka Criteria** is the most widely used clinical tool for diagnosing **Atopic Dermatitis (AD)** in epidemiological studies and clinical practice. While the original Hanifin and Rajka criteria (1980) are considered the gold standard, they were deemed too cumbersome for routine use. The UK Working Party simplified these into a more practical set of criteria. To meet the UK diagnostic criteria, a patient must have an **itchy skin condition (pruritus)** plus three or more of the following: 1. History of involvement of the skin creases (flexural dermatitis). 2. Personal history of asthma or hay fever (or history of atopic disease in a first-degree relative if the child is under 4). 3. History of a general dry skin in the last year. 4. Visible flexural eczema. 5. Onset under the age of 2 years. **Analysis of Incorrect Options:** * **B. Nummular Eczema:** Characterized by coin-shaped, well-demarcated plaques; diagnosis is purely clinical and does not use these specific criteria. * **C. Eczema Herpeticum:** A viral complication (HSV-1) of AD; diagnosis is clinical or via Tzanck smear/PCR. * **D. Contact Dermatitis:** Diagnosed via history and **Patch Testing**, not the UK refinement criteria. **High-Yield Clinical Pearls for NEET-PG:** * **Hanifin & Rajka Criteria:** Consists of 4 Major and 23 Minor criteria (3 of each required for diagnosis). * **Atopic March:** The typical progression from Atopic Dermatitis → Food Allergy → Asthma → Allergic Rhinitis. * **Dennier-Morgan Fold:** An extra fold of skin under the lower eyelid, a minor criterion for AD. * **Filaggrin (FLG) Mutation:** The most common genetic association with Atopic Dermatitis.

Q: Commonest site of Atopic dermatitis is:

Ante-cubital fossa. **Explanation:** Atopic Dermatitis (AD) is a chronic, relapsing inflammatory skin condition characterized by intense pruritus and a characteristic age-dependent distribution. The correct answer is **Ante-cubital fossa** because it represents the classic **flexural involvement** seen in the childhood and adult phases of the disease. **Why Ante-cubital fossa is correct:** In patients beyond infancy (children, adolescents, and adults), the morphology of AD shifts from exudative lesions to lichenified plaques. These lesions characteristically involve the flexural surfaces, specifically the **ante-cubital** and **popliteal fossae**, the neck, and the wrists. This is a hallmark diagnostic feature in the Hanifin and Rajka criteria. **Why other options are incorrect:** * **Scalp:** While the scalp can be involved in infantile AD (often confused with seborrheic dermatitis), it is not the "commonest" or most characteristic site across the broader age spectrum. * **Elbow:** The **extensor** aspect of the elbow is typically involved in **psoriasis**. In AD, extensor involvement is usually limited to the infantile phase; as the child grows, the disease "moves" to the flexures. * **Trunk:** While the trunk can be affected in severe or generalized cases (erythroderma), it is rarely the primary or most common site of localization compared to the limbs. **High-Yield Clinical Pearls for NEET-PG:** * **Infantile Phase (<2 years):** Characteristically involves the **face (cheeks)** and extensor surfaces. The diaper area is usually spared. * **Childhood/Adult Phase:** Characteristically involves **flexures** (ante-cubital/popliteal). * **Dennie-Morgan fold:** An extra fold of skin under the lower eyelid, a classic sign of atopy. * **Filaggrin (FLG) mutation:** The most common genetic defect associated with skin barrier dysfunction in AD. * **Serum IgE:** Usually elevated in the "extrinsic" type of Atopic Dermatitis.

Q: Dennie Morgan folds are seen in which of the following conditions?

Atopic dermatitis. **Explanation:** **Dennie-Morgan folds** (also known as Dennie-Morgan lines or infraorbital folds) are a characteristic clinical sign of **Atopic Dermatitis (AD)**. They are defined as single or double symmetrical folds or lines situated below the lower eyelid margin. These folds result from chronic inflammation and edema of the lower eyelid, often exacerbated by frequent rubbing of the eyes due to the intense pruritus associated with the "itch-scratch cycle" in atopic individuals. **Analysis of Options:** * **Atopic Dermatitis (Correct):** It is a chronic, relapsing inflammatory skin disease. Dennie-Morgan folds are considered a minor diagnostic criterion (Hanifin and Rajka criteria) for AD, along with other signs like xerosis, ichthyosis, and keratosis pilaris. * **Lichen Planus:** Characterized by the "6 Ps" (Planar, Purple, Polygonal, Pruritic, Papules, and Plaques) and Wickham striae. It does not typically involve infraorbital fold formation. * **Keratosis Pilaris:** While frequently associated with atopy (comorbidity), it refers specifically to keratinous plugging of hair follicles, usually on the extensor surfaces of the arms and thighs ("chicken skin"). * **Nummular Eczema:** Presents as coin-shaped, well-demarcated eczematous plaques. It lacks the systemic stigmata and specific facial signs like Dennie-Morgan folds. **Clinical Pearls for NEET-PG:** * **Hertoghe’s Sign:** Thinning or loss of the outer third of the eyebrows; also seen in Atopic Dermatitis (and Hypothyroidism). * **Pityriasis Alba:** Hypopigmented, slightly scaly patches on the face; a common minor feature of AD in children. * **Hyperlinear palms:** Increased skin markings on the palms, often seen in AD patients with associated Ichthyosis vulgaris (FLG gene mutation). * **Dermatographism:** Patients with AD often show **white dermatographism** (vasoconstriction) instead of the typical red response.

Q: A 22-year-old woman develops an acute contact dermatitis to a household-cleaning agent. Which of the following treatments is most appropriate during the bullous, oozing stage?

Wet dressings. **Explanation:** The management of dermatitis is guided by the **morphology and stage of the lesion**. This patient is in the **acute stage** of contact dermatitis, characterized by vesicles, bullae, and oozing (weeping). **1. Why Wet Dressings are Correct:** In the acute, exudative phase, the primary goal is to "dry" the lesion and reduce inflammation. **Wet dressings** (using saline or Burow’s solution) work via evaporation, which causes vasoconstriction, reduces pruritus, and debrides crusts. The dermatological rule of thumb is: *"If it’s wet, dry it; if it’s dry, wet it."* Topical ointments are contraindicated here as they trap moisture and can cause maceration. **2. Why Other Options are Incorrect:** * **Systemic Corticosteroids:** While effective for severe or generalized cases, they are not the first-line treatment for localized acute contact dermatitis. Topical therapy is preferred initially unless the involvement is >20% of the body surface area. * **Topical Anesthetics:** These are generally avoided because they are potent sensitizers and can trigger a secondary **allergic contact dermatitis**, worsening the condition. * **Systemic Antibiotics:** These are only indicated if there is evidence of a secondary bacterial infection (e.g., honey-colored crusting, pustules, or lymphadenopathy). Oozing alone is a sign of primary inflammation, not necessarily infection. **Clinical Pearls for NEET-PG:** * **Acute Stage:** Oozing/Vesicles → Treatment: Wet compresses/dressings. * **Subacute Stage:** Redness/Scaling → Treatment: Creams. * **Chronic Stage:** Lichenification/Dryness → Treatment: Ointments (occlusive). * **Patch Test:** The gold standard investigation for Allergic Contact Dermatitis (Read at 48 and 72/96 hours). * **Most common cause of ACD worldwide:** Nickel (Type IV Hypersensitivity).

Q: White radiating lines on the buccal mucosa are characteristic of which condition?

Oral lichen planus. ### Explanation **Correct Answer: D. Oral lichen planus** **Why it is correct:** The "white radiating lines" described are known as **Wickham striae**. These are a hallmark clinical feature of Lichen Planus (LP). In the oral cavity, this most commonly presents as the **reticular subtype**, characterized by a lace-like pattern of white lines, papules, and streaks on the buccal mucosa. Pathologically, these lines correspond to areas of focal hypergranulosis and orthokeratosis above the tips of the dermal papillae. Oral LP is often bilateral and symmetrical. **Why the other options are incorrect:** * **Leukoplakia (A):** This presents as a persistent white patch or plaque that **cannot be scraped off** and cannot be characterized clinically as any other disease. It lacks the specific radiating, lace-like pattern of Wickham striae. * **Erythroplakia (B):** This presents as a fiery red, well-demarcated patch. It is a high-risk precancerous lesion but does not feature white radiating lines. * **Oral Submucous Fibrosis (C):** This is characterized by progressive juxta-epithelial fibrosis leading to **stiffness of the oral mucosa** and restricted mouth opening (trismus). While the mucosa may appear pale or blanched, it presents with palpable fibrous bands rather than radiating striae. **High-Yield Clinical Pearls for NEET-PG:** * **Civatte bodies (Cytoid bodies):** These are apoptotic keratinocytes found at the dermo-epidermal junction in LP. * **Max-Joseph spaces:** Small clefts formed between the epidermis and dermis due to basal cell degeneration. * **6 P’s of Cutaneous LP:** Planar (flat-topped), Purple, Polygonal, Pruritic, Papules, and Plaques. * **Koebner Phenomenon:** New lesions appearing at the site of trauma (also seen in Psoriasis and Vitiligo). * **Malignant potential:** Oral LP (especially the erosive type) has a small risk of transformation into Squamous Cell Carcinoma (SCC).

Q: Which of the following are pruritic lesions?

All of the above. **Explanation:** Pruritus (itching) is a hallmark symptom of many dermatological conditions, and understanding its presence or absence is a key diagnostic tool in NEET-PG questions. * **Lichen Planus:** This is one of the classic "itchy" dermatoses. It is characterized by the **6 P’s**: Planar (flat-topped), Purple, Polygonal, Pruritic, Papules, and Plaques. The itching in Lichen Planus is often intense and is a defining clinical feature. * **Sunburns:** Acute UV-induced inflammation leads to the release of mediators like histamine, prostaglandins, and cytokines. While pain and burning are prominent, the healing phase (and sometimes the peak inflammatory phase) is significantly pruritic. * **Pemphigoid (Bullous Pemphigoid):** Unlike Pemphigus Vulgaris (which is typically painful), Bullous Pemphigoid is notoriously **pruritic**. In fact, a "pre-eruptive" or "urticarial" phase characterized by intense itching often precedes the appearance of tense blisters by weeks or months. Since all three conditions are associated with pruritus, **Option D (All of the above)** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "Big Three" Itchy Conditions:** Always remember Scabies, Lichen Planus, and Dermatitis Herpetiformis for severe pruritus. 2. **Pemphigus vs. Pemphigoid:** Pemphigus = Painful (flaccid bullae); Pemphigoid = Pruritic (tense bullae). 3. **Wickham Striae:** Look for these white reticular patterns on the surface of Lichen Planus papules. 4. **Koebner Phenomenon:** Lichen planus (along with Psoriasis and Vitiligo) shows new lesions at sites of trauma, often triggered by scratching due to the intense pruritus.

Q: What is one of the most serious complications of urticaria?

Anaphylactic shock. **Explanation:** **Urticaria** (hives) is characterized by transient, itchy wheals caused by dermal edema due to the release of histamine and other mediators from mast cells. While most cases are self-limiting, the most serious complication is its progression into **Anaphylactic shock**. 1. **Why Anaphylactic Shock is Correct:** Urticaria is often a cutaneous manifestation of a Type I (IgE-mediated) hypersensitivity reaction. If the systemic release of mediators is massive, it leads to generalized vasodilation and increased capillary permeability. This results in a rapid drop in blood pressure (shock) and potential airway obstruction (laryngeal edema), which is life-threatening. 2. **Why Other Options are Incorrect:** * **Heart block:** This is a conduction abnormality (e.g., seen in Rheumatic fever or Lyme disease) and is not a direct complication of the histamine-driven process of urticaria. * **Cerebral edema:** While systemic fluid shifts occur in anaphylaxis, localized cerebral edema is not a standard or primary complication of urticaria. * **Septicemia:** This is a systemic bacterial infection. Urticaria is an inflammatory/allergic process, not an infectious one, unless secondary skin infection occurs due to chronic scratching (which is rare and not "most serious"). **High-Yield Clinical Pearls for NEET-PG:** * **Angioedema:** When the swelling involves the deep dermis and subcutaneous tissues, it is called angioedema. If it involves the larynx, it is a medical emergency. * **Drug of Choice:** The immediate treatment for anaphylaxis is **Intramuscular Adrenaline (1:1000)** at a dose of 0.5 mg in adults. * **Chronic Urticaria:** Defined as wheals occurring for **>6 weeks**. * **Darier’s Sign:** Rubbing a lesion of Urticaria Pigmentosa (Mastocytosis) leads to wheal formation; this is a classic diagnostic sign.

Dermatitis and Eczema Indian Medical PG Practice Questions and MCQs

Question 1: A 22-year-old female presents with dry papules in the seborrheic areas, especially in the summer. Her father also has a history of similar lesions. What is the most probable diagnosis?

A. Pemphigus foliaceus
B. Keratosis pilaris
C. Darier's disease (Correct Answer)
D. Seborrheic dermatitis

Explanation: ### Explanation **Correct Answer: C. Darier’s Disease** **Why it is correct:** Darier’s disease (Keratosis Follicularis) is an autosomal dominant genodermatosis caused by a mutation in the **ATP2A2 gene**, which encodes the **SERCA2 calcium pump**. This defect leads to a loss of cell-to-cell adhesion (acantholysis) and abnormal keratinization. * **Clinical Presentation:** It typically manifests as greasy, crusted, "dirty-looking" **malodorous papules** in a **seborrheic distribution** (chest, back, forehead, and scalp). * **Exacerbating Factors:** A classic hallmark is **photo-exacerbation**; lesions characteristically flare up during the **summer** due to heat, humidity, and UV exposure. The positive family history in this case further supports an inherited condition. **Why the other options are incorrect:** * **A. Pemphigus foliaceus:** While it involves acantholysis and affects seborrheic areas, it presents with superficial blisters and erosions rather than persistent keratotic papules, and it lacks a strong genetic/hereditary pattern. * **B. Keratosis pilaris:** Presents as "goose-flesh" papules on the extensor surfaces of arms and thighs. It is not typically found in seborrheic areas and does not flare specifically with summer heat. * **D. Seborrheic dermatitis:** Though it occurs in the same distribution, it presents as erythematous plaques with greasy yellow scales (dandruff-like) rather than discrete keratotic papules, and it usually improves or remains stable in summer rather than worsening. **High-Yield Clinical Pearls for NEET-PG:** * **Nail Findings:** Pathognomonic **"V-shaped" nicking** at the distal margin and longitudinal red/white bands. * **Mucosal Findings:** "Cobblestone" appearance of the oral mucosa. * **Histopathology:** Look for **"Corps ronds"** (in the stratum spinosum) and **"Grains"** (in the stratum corneum). * **Hand Findings:** Palmar pits and punctate keratosis.

Question 2: The UK refinement of Hannifin and Rajka criteria is used in the diagnosis of which condition?

A. Atopic dermatitis (Correct Answer)
B. Nummular Eczema
C. Eczema Herpeticum
D. Contact dermatitis

Explanation: **Explanation:** The **UK Refinement of the Hanifin and Rajka Criteria** is the most widely used clinical tool for diagnosing **Atopic Dermatitis (AD)** in epidemiological studies and clinical practice. While the original Hanifin and Rajka criteria (1980) are considered the gold standard, they were deemed too cumbersome for routine use. The UK Working Party simplified these into a more practical set of criteria. To meet the UK diagnostic criteria, a patient must have an **itchy skin condition (pruritus)** plus three or more of the following: 1. History of involvement of the skin creases (flexural dermatitis). 2. Personal history of asthma or hay fever (or history of atopic disease in a first-degree relative if the child is under 4). 3. History of a general dry skin in the last year. 4. Visible flexural eczema. 5. Onset under the age of 2 years. **Analysis of Incorrect Options:** * **B. Nummular Eczema:** Characterized by coin-shaped, well-demarcated plaques; diagnosis is purely clinical and does not use these specific criteria. * **C. Eczema Herpeticum:** A viral complication (HSV-1) of AD; diagnosis is clinical or via Tzanck smear/PCR. * **D. Contact Dermatitis:** Diagnosed via history and **Patch Testing**, not the UK refinement criteria. **High-Yield Clinical Pearls for NEET-PG:** * **Hanifin & Rajka Criteria:** Consists of 4 Major and 23 Minor criteria (3 of each required for diagnosis). * **Atopic March:** The typical progression from Atopic Dermatitis → Food Allergy → Asthma → Allergic Rhinitis. * **Dennier-Morgan Fold:** An extra fold of skin under the lower eyelid, a minor criterion for AD. * **Filaggrin (FLG) Mutation:** The most common genetic association with Atopic Dermatitis.

Question 3: Commonest site of Atopic dermatitis is:

A. Scalp
B. Elbow
C. Ante-cubital fossa (Correct Answer)
D. Trunk

Explanation: **Explanation:** Atopic Dermatitis (AD) is a chronic, relapsing inflammatory skin condition characterized by intense pruritus and a characteristic age-dependent distribution. The correct answer is **Ante-cubital fossa** because it represents the classic **flexural involvement** seen in the childhood and adult phases of the disease. **Why Ante-cubital fossa is correct:** In patients beyond infancy (children, adolescents, and adults), the morphology of AD shifts from exudative lesions to lichenified plaques. These lesions characteristically involve the flexural surfaces, specifically the **ante-cubital** and **popliteal fossae**, the neck, and the wrists. This is a hallmark diagnostic feature in the Hanifin and Rajka criteria. **Why other options are incorrect:** * **Scalp:** While the scalp can be involved in infantile AD (often confused with seborrheic dermatitis), it is not the "commonest" or most characteristic site across the broader age spectrum. * **Elbow:** The **extensor** aspect of the elbow is typically involved in **psoriasis**. In AD, extensor involvement is usually limited to the infantile phase; as the child grows, the disease "moves" to the flexures. * **Trunk:** While the trunk can be affected in severe or generalized cases (erythroderma), it is rarely the primary or most common site of localization compared to the limbs. **High-Yield Clinical Pearls for NEET-PG:** * **Infantile Phase (<2 years):** Characteristically involves the **face (cheeks)** and extensor surfaces. The diaper area is usually spared. * **Childhood/Adult Phase:** Characteristically involves **flexures** (ante-cubital/popliteal). * **Dennie-Morgan fold:** An extra fold of skin under the lower eyelid, a classic sign of atopy. * **Filaggrin (FLG) mutation:** The most common genetic defect associated with skin barrier dysfunction in AD. * **Serum IgE:** Usually elevated in the "extrinsic" type of Atopic Dermatitis.

Question 4: Dennie Morgan folds are seen in which of the following conditions?

A. Lichen planus
B. Atopic dermatitis (Correct Answer)
C. Keratosis pilaris
D. Nummular eczema

Explanation: **Explanation:** **Dennie-Morgan folds** (also known as Dennie-Morgan lines or infraorbital folds) are a characteristic clinical sign of **Atopic Dermatitis (AD)**. They are defined as single or double symmetrical folds or lines situated below the lower eyelid margin. These folds result from chronic inflammation and edema of the lower eyelid, often exacerbated by frequent rubbing of the eyes due to the intense pruritus associated with the "itch-scratch cycle" in atopic individuals. **Analysis of Options:** * **Atopic Dermatitis (Correct):** It is a chronic, relapsing inflammatory skin disease. Dennie-Morgan folds are considered a minor diagnostic criterion (Hanifin and Rajka criteria) for AD, along with other signs like xerosis, ichthyosis, and keratosis pilaris. * **Lichen Planus:** Characterized by the "6 Ps" (Planar, Purple, Polygonal, Pruritic, Papules, and Plaques) and Wickham striae. It does not typically involve infraorbital fold formation. * **Keratosis Pilaris:** While frequently associated with atopy (comorbidity), it refers specifically to keratinous plugging of hair follicles, usually on the extensor surfaces of the arms and thighs ("chicken skin"). * **Nummular Eczema:** Presents as coin-shaped, well-demarcated eczematous plaques. It lacks the systemic stigmata and specific facial signs like Dennie-Morgan folds. **Clinical Pearls for NEET-PG:** * **Hertoghe’s Sign:** Thinning or loss of the outer third of the eyebrows; also seen in Atopic Dermatitis (and Hypothyroidism). * **Pityriasis Alba:** Hypopigmented, slightly scaly patches on the face; a common minor feature of AD in children. * **Hyperlinear palms:** Increased skin markings on the palms, often seen in AD patients with associated Ichthyosis vulgaris (FLG gene mutation). * **Dermatographism:** Patients with AD often show **white dermatographism** (vasoconstriction) instead of the typical red response.

Question 5: A boy presents with erythematous scaly papules with crusting over on the antecubital fossa. He was applying a petroleum-based emollient in the shower. What is the next step in management?

A. Decrease the frequency of petroleum-based emollient application.
B. Decrease the frequency of showering.
C. Apply mupirocin 1% topically.
D. Apply triamcinolone cream topically. (Correct Answer)

Explanation: ### Explanation **Diagnosis: Atopic Dermatitis (Exacerbation)** The clinical presentation of erythematous scaly papules with crusting in the **antecubital fossa** (a classic flexural site) in a young patient is hallmark for **Atopic Dermatitis (AD)**. While the use of petroleum-based emollients is standard for maintenance, the presence of active inflammation (erythema, scaling) indicates an acute flare-up that requires pharmacological intervention beyond simple hydration. **1. Why Option D is Correct:** **Topical Corticosteroids (TCS)**, such as **Triamcinolone cream**, are the first-line treatment for acute flares of Atopic Dermatitis. They work by reducing inflammation, suppressing the immune response, and relieving pruritus. In the "step-up" management of AD, emollients are used for maintenance, but topical steroids are mandatory once clinical lesions (papules/scaling) appear. **2. Why Other Options are Incorrect:** * **Option A:** Decreasing emollient frequency is counterproductive. Emollients are the cornerstone of AD therapy to repair the skin barrier (filaggrin deficiency); however, they alone cannot suppress an active inflammatory flare. * **Option B:** While excessive hot water can irritate the skin, "decreasing the frequency of showering" is not the primary management for active lesions. Short, lukewarm showers followed immediately by emollients ("soak and seal") are actually recommended. * **Option C:** Mupirocin is an antibiotic. While "crusting" can suggest secondary *Staphylococcus aureus* infection (impetiginization), the primary pathology here is the underlying eczematous flare. Unless there is frank purulence or systemic symptoms, topical steroids (often combined with antibiotics if needed) are the priority. **Clinical Pearls for NEET-PG:** * **Distribution by Age:** Infants (Extensors/Face); Children/Adults (Flexures like antecubital/popliteal fossae). * **Major Criteria (Hanifin & Rajka):** Pruritus, Typical morphology/distribution, Chronic/relapsing course, Personal/family history of atopy. * **Steroid Sparing Agents:** Topical Calcineurin Inhibitors (Tacrolimus/Pimecrolimus) are used for maintenance or sensitive areas (face/folds) to avoid steroid-induced skin atrophy. * **The "Atopic March":** AD usually precedes allergic rhinitis and asthma.

Question 6: A 22-year-old woman develops an acute contact dermatitis to a household-cleaning agent. Which of the following treatments is most appropriate during the bullous, oozing stage?

A. Wet dressings (Correct Answer)
B. Systemic corticosteroids
C. Topical anesthetics
D. Systemic antibiotics

Explanation: **Explanation:** The management of dermatitis is guided by the **morphology and stage of the lesion**. This patient is in the **acute stage** of contact dermatitis, characterized by vesicles, bullae, and oozing (weeping). **1. Why Wet Dressings are Correct:** In the acute, exudative phase, the primary goal is to "dry" the lesion and reduce inflammation. **Wet dressings** (using saline or Burow’s solution) work via evaporation, which causes vasoconstriction, reduces pruritus, and debrides crusts. The dermatological rule of thumb is: *"If it’s wet, dry it; if it’s dry, wet it."* Topical ointments are contraindicated here as they trap moisture and can cause maceration. **2. Why Other Options are Incorrect:** * **Systemic Corticosteroids:** While effective for severe or generalized cases, they are not the first-line treatment for localized acute contact dermatitis. Topical therapy is preferred initially unless the involvement is >20% of the body surface area. * **Topical Anesthetics:** These are generally avoided because they are potent sensitizers and can trigger a secondary **allergic contact dermatitis**, worsening the condition. * **Systemic Antibiotics:** These are only indicated if there is evidence of a secondary bacterial infection (e.g., honey-colored crusting, pustules, or lymphadenopathy). Oozing alone is a sign of primary inflammation, not necessarily infection. **Clinical Pearls for NEET-PG:** * **Acute Stage:** Oozing/Vesicles → Treatment: Wet compresses/dressings. * **Subacute Stage:** Redness/Scaling → Treatment: Creams. * **Chronic Stage:** Lichenification/Dryness → Treatment: Ointments (occlusive). * **Patch Test:** The gold standard investigation for Allergic Contact Dermatitis (Read at 48 and 72/96 hours). * **Most common cause of ACD worldwide:** Nickel (Type IV Hypersensitivity).

Question 7: Berloque dermatitis is due to contact with which of the following?

A. Plants
B. Food (Correct Answer)
C. Cosmetics
D. Metal

Explanation: **Explanation:** **Berloque dermatitis** (also known as perfume dermatitis) is a classic example of **photocontact dermatitis**. It is caused by the interaction between ultraviolet A (UVA) radiation and **psoralens** (specifically 5-methoxypsoralen or Bergapten) found in certain substances. **Why "Food" is the correct answer:** While traditionally associated with perfumes containing oil of bergamot, Berloque dermatitis is frequently triggered by contact with **food items** rich in furocoumarins (psoralens). Common culprits include **citrus fruits (limes, lemons), celery, parsley, and figs**. When the juice of these foods contacts the skin followed by sun exposure, a phototoxic reaction occurs, leading to the characteristic "pendant-like" or streaky hyperpigmentation. In many modern medical examinations, "Food" or "Plants" are used interchangeably for this condition, but given the specific options, food items containing bergamot/psoralens are the primary source. **Analysis of Incorrect Options:** * **Plants:** While some plants cause phytophotodermatitis, Berloque dermatitis specifically refers to the reaction caused by bergamot oil, which is most commonly encountered via citrus extracts (food/essences). * **Cosmetics:** Though perfumes are cosmetics, the term "Berloque" specifically targets the psoralen component found in natural extracts (food/botanicals) rather than synthetic cosmetic chemicals or metals. * **Metal:** Metal contact typically causes Allergic Contact Dermatitis (Type IV hypersensitivity), such as Nickel dermatitis, which does not require UV light for a reaction. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Caused by **Bergapten** (5-methoxypsoralen). * **Clinical Feature:** Characterized by **hyperpigmentation** in a "droplet" or "pendant" configuration (Berloque means "trinket" or "pendant" in French). * **Mechanism:** It is a **Phototoxic reaction** (non-immunological), not photoallergic. * **Diagnosis:** Usually clinical; history of handling citrus/perfumes followed by sun exposure.

Question 8: White radiating lines on the buccal mucosa are characteristic of which condition?

A. Leukoplakia
B. Erythroplakia
C. Oral submucous fibrosis (OSF)
D. Oral lichen planus (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Oral lichen planus** **Why it is correct:** The "white radiating lines" described are known as **Wickham striae**. These are a hallmark clinical feature of Lichen Planus (LP). In the oral cavity, this most commonly presents as the **reticular subtype**, characterized by a lace-like pattern of white lines, papules, and streaks on the buccal mucosa. Pathologically, these lines correspond to areas of focal hypergranulosis and orthokeratosis above the tips of the dermal papillae. Oral LP is often bilateral and symmetrical. **Why the other options are incorrect:** * **Leukoplakia (A):** This presents as a persistent white patch or plaque that **cannot be scraped off** and cannot be characterized clinically as any other disease. It lacks the specific radiating, lace-like pattern of Wickham striae. * **Erythroplakia (B):** This presents as a fiery red, well-demarcated patch. It is a high-risk precancerous lesion but does not feature white radiating lines. * **Oral Submucous Fibrosis (C):** This is characterized by progressive juxta-epithelial fibrosis leading to **stiffness of the oral mucosa** and restricted mouth opening (trismus). While the mucosa may appear pale or blanched, it presents with palpable fibrous bands rather than radiating striae. **High-Yield Clinical Pearls for NEET-PG:** * **Civatte bodies (Cytoid bodies):** These are apoptotic keratinocytes found at the dermo-epidermal junction in LP. * **Max-Joseph spaces:** Small clefts formed between the epidermis and dermis due to basal cell degeneration. * **6 P’s of Cutaneous LP:** Planar (flat-topped), Purple, Polygonal, Pruritic, Papules, and Plaques. * **Koebner Phenomenon:** New lesions appearing at the site of trauma (also seen in Psoriasis and Vitiligo). * **Malignant potential:** Oral LP (especially the erosive type) has a small risk of transformation into Squamous Cell Carcinoma (SCC).

Question 9: Which of the following are pruritic lesions?

A. Lichen planus
B. Sun burns
C. Pemphigoid
D. All of the above (Correct Answer)

Explanation: **Explanation:** Pruritus (itching) is a hallmark symptom of many dermatological conditions, and understanding its presence or absence is a key diagnostic tool in NEET-PG questions. * **Lichen Planus:** This is one of the classic "itchy" dermatoses. It is characterized by the **6 P’s**: Planar (flat-topped), Purple, Polygonal, Pruritic, Papules, and Plaques. The itching in Lichen Planus is often intense and is a defining clinical feature. * **Sunburns:** Acute UV-induced inflammation leads to the release of mediators like histamine, prostaglandins, and cytokines. While pain and burning are prominent, the healing phase (and sometimes the peak inflammatory phase) is significantly pruritic. * **Pemphigoid (Bullous Pemphigoid):** Unlike Pemphigus Vulgaris (which is typically painful), Bullous Pemphigoid is notoriously **pruritic**. In fact, a "pre-eruptive" or "urticarial" phase characterized by intense itching often precedes the appearance of tense blisters by weeks or months. Since all three conditions are associated with pruritus, **Option D (All of the above)** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "Big Three" Itchy Conditions:** Always remember Scabies, Lichen Planus, and Dermatitis Herpetiformis for severe pruritus. 2. **Pemphigus vs. Pemphigoid:** Pemphigus = Painful (flaccid bullae); Pemphigoid = Pruritic (tense bullae). 3. **Wickham Striae:** Look for these white reticular patterns on the surface of Lichen Planus papules. 4. **Koebner Phenomenon:** Lichen planus (along with Psoriasis and Vitiligo) shows new lesions at sites of trauma, often triggered by scratching due to the intense pruritus.

Question 10: What is one of the most serious complications of urticaria?

A. Anaphylactic shock (Correct Answer)
B. Heart block
C. Cerebral edema
D. Septicemia

Explanation: **Explanation:** **Urticaria** (hives) is characterized by transient, itchy wheals caused by dermal edema due to the release of histamine and other mediators from mast cells. While most cases are self-limiting, the most serious complication is its progression into **Anaphylactic shock**. 1. **Why Anaphylactic Shock is Correct:** Urticaria is often a cutaneous manifestation of a Type I (IgE-mediated) hypersensitivity reaction. If the systemic release of mediators is massive, it leads to generalized vasodilation and increased capillary permeability. This results in a rapid drop in blood pressure (shock) and potential airway obstruction (laryngeal edema), which is life-threatening. 2. **Why Other Options are Incorrect:** * **Heart block:** This is a conduction abnormality (e.g., seen in Rheumatic fever or Lyme disease) and is not a direct complication of the histamine-driven process of urticaria. * **Cerebral edema:** While systemic fluid shifts occur in anaphylaxis, localized cerebral edema is not a standard or primary complication of urticaria. * **Septicemia:** This is a systemic bacterial infection. Urticaria is an inflammatory/allergic process, not an infectious one, unless secondary skin infection occurs due to chronic scratching (which is rare and not "most serious"). **High-Yield Clinical Pearls for NEET-PG:** * **Angioedema:** When the swelling involves the deep dermis and subcutaneous tissues, it is called angioedema. If it involves the larynx, it is a medical emergency. * **Drug of Choice:** The immediate treatment for anaphylaxis is **Intramuscular Adrenaline (1:1000)** at a dose of 0.5 mg in adults. * **Chronic Urticaria:** Defined as wheals occurring for **>6 weeks**. * **Darier’s Sign:** Rubbing a lesion of Urticaria Pigmentosa (Mastocytosis) leads to wheal formation; this is a classic diagnostic sign.

Practice by Chapter

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