Lichen Simplex Chronicus — MCQs
A 70-year-old man comes to the emergency department because of a skin rash and severe itching. He appears ill; there is a generalized skin rash that is scaly, erythematous, and thickened. His palms, soles, and scalp are also involved. Which of the following is the most likely diagnosis?
A child presented with asymptomatic lesions on the forearm and on the shaft of the penis. The lesions on the forearm are shown below. What is the most likely diagnosis?
Scabies oral treatment of choice:
The following is an important feature of psoriasis:
Lines of Blaschko are related to?
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?
Spongiosis is a characteristic histological finding in which of the following conditions?
The UK refinement of Hannifin and Rajka criteria is used in the diagnosis of which condition?
What is the most common site of Atopic dermatitis?
Pomphylox affects which area of the body?
Lichen Simplex Chronicus Indian Medical PG Practice Questions and MCQs
Question 1: A 70-year-old man comes to the emergency department because of a skin rash and severe itching. He appears ill; there is a generalized skin rash that is scaly, erythematous, and thickened. His palms, soles, and scalp are also involved. Which of the following is the most likely diagnosis?
- A. erythroderma (exfoliative dermatitis) (Correct Answer)
- B. pemphigus vulgaris
- C. dermatitis herpetiformis
- D. rosacea
Explanation: ***erythroderma (exfoliative dermatitis)*** - Erythroderma is characterized by a **generalized erythematous (red), scaly, and thickened skin rash** covering more than 90% of the body surface, accompanied by **severe itching**. - This condition is often associated with a **systemic illness**, and the patient's description of "appears ill" further supports this diagnosis. *pemphigus vulgaris* - Pemphigus vulgaris typically presents with **flaccid blisters** and erosions, particularly affecting mucous membranes, which are not described here. - While it can be widespread, the primary lesion is a **blister** rather than diffuse erythema and scaling. *dermatitis herpetiformis* - Dermatitis herpetiformis is characterized by intensely **pruritic (itchy) papules and vesicles** typically found on the extensor surfaces (e.g., elbows, knees, buttocks). - It is strongly associated with **celiac disease** and does not present as a generalized scaly, erythematous thickening. *rosacea* - Rosacea primarily affects the **face**, causing **erythema**, flushing, papules, and pustules, often sparing the palms, soles, and scalp. - It is not characterized by generalized scaling, thickening, or severe itching over the entire body.
Question 2: A child presented with asymptomatic lesions on the forearm and on the shaft of the penis. The lesions on the forearm are shown below. What is the most likely diagnosis?
- A. Lichen planus
- B. Lichen nitidus (Correct Answer)
- C. Scabies
- D. Scrofuloderma
Explanation: ***Lichen nitidus*** - Presents as **multiple, asymptomatic, tiny (1-2 mm), shiny, dome-shaped papules** that are often skin-colored or slightly hypopigmented, as seen in the image and described. - Common sites include the **forearms, penis, abdomen, and flexural areas**, consistent with the case presentation. *Lichen planus* - Characterized by **purplish, polygonal, planar, pruritic papules and plaques**, often with **Wickham's striae**, which are not seen in the image. - While it can affect the penis, its lesions are typically more intensely colored and often symptomatic (**itchy**), unlike the asymptomatic lesions described. *Scabies* - Presents with intensely **pruritic papules, vesicles, and burrows**, especially in the web spaces of fingers, wrists, axillae, and genitalia, which are very symptomatic and not usually described as shiny papules. - The primary symptom is **severe itching**, which is absent in this patient. *Scrofuloderma* - A form of **cutaneous tuberculosis** presenting as cold abscesses that eventually rupture to form ulcers, sinuses, and scars. - The image shows distinct, small papules, not ulcerating or scarring lesions characteristic of scrofuloderma.
Question 3: Scabies oral treatment of choice:
- A. Benzyl Benzoate
- B. Ivermectin (Correct Answer)
- C. Lindane
- D. Permethrin
Explanation: ***Ivermectin*** - **Ivermectin** is the **oral treatment of choice** for scabies, especially in cases of crusted (Norwegian) scabies, immunocompromised patients, or when topical treatments fail. - It works by disrupting the **neurotransmitter system** of parasites, leading to paralysis and death of the scabies mites. *Benzyl Benzoate* - **Benzyl benzoate** is a **topical scabicide** and acaricide, used as a lotion or emulsion. - It is not available as an oral formulation and is typically reserved for cases where other topical agents are ineffective or contraindicated. *Lindane* - **Lindane** (gamma-hexachlorocyclohexane) is a topical scabicide but is **not recommended as a first-line treatment** due to potential **neurotoxicity** (seizures) especially in infants, children, and individuals with extensive skin excoriations. - It is used topically and has significant systemic absorption, making its use limited. *Permethrin* - **Permethrin** cream is considered the **first-line topical treatment** for scabies, showing high efficacy and a good safety profile. - It is not an oral medication; it is applied topically to the skin to kill mites.
Question 4: The following is an important feature of psoriasis:
- A. Erythematous macules
- B. Crusting
- C. Silvery Scaling (Correct Answer)
- D. Coarse bleeding
Explanation: ***Silvery Scaling*** - **Silvery scaling** is a hallmark clinical feature of **psoriasis**, resulting from the rapid turnover of skin cells. - These scales often appear on **erythematous plaques** and can be easily scraped off, sometimes revealing pinpoint bleeding underneath (**Auspitz sign**). *Erythematous macules* - While psoriasis does involve **erythema** (redness), the primary lesions are typically **plaques**, not macules (flat, discolored spots). - Macules are seen in other dermatological conditions such as drug eruptions or early viral exanthems, but not as the definitive feature of psoriasis. *Crusting* - **Crusting** is a feature of conditions involving exudation and drying of serum, blood, or pus, such as **impetigo** or **eczema** with secondary infection. - It is not a characteristic primary lesion of psoriasis, although secondary infection of psoriatic plaques could theoretically lead to crusting. *Coarse bleeding* - **Coarse bleeding** is not a primary feature of psoriasis; however, when psoriatic scales are removed, pinpoint bleeding known as the **Auspitz sign** can occur. - This is distinct from frank, coarse bleeding and is a diagnostic clue rather than a characteristic lesion in itself.
Question 5: Lines of Blaschko are related to?
- A. Keratinocytes (Correct Answer)
- B. Blood vessels
- C. Nerves
- D. Bones
Explanation: ***Keratinocytes*** - **Lines of Blaschko** represent the migratory pathways of embryonic cells, primarily **keratinocytes**, in the skin. - These lines are not visible under normal conditions but become apparent in various **genetic skin disorders** where abnormal cells follow these specific patterns. *Blood vessels* - While blood vessels are extensively present in the skin, they do not follow the specific **migratory patterns** described by the Lines of Blaschko. - Their arrangement is more related to **vascular networks** and anatomical supply rather than embryonic cell migration. *Nerves* - **Nerves** in the skin have specific distributions, often following dermatomal patterns, which are distinct from the **Lines of Blaschko**. - Nerve distribution is related to their segmental origin from the **spinal cord**, not the migratory paths of epidermal cells. *Bones* - **Bones** are part of the skeletal system and are not found in the skin, making them unrelated to the **Lines of Blaschko**. - These lines describe epidermal cell migration, which is a feature of the **integumentary system**.
Question 6: 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 7: Spongiosis is a characteristic histological finding in which of the following conditions?
- A. Acute eczema (Correct Answer)
- B. Lichen planus
- C. Psoriasis
- D. Pemphigus
Explanation: **Explanation:** **Spongiosis** is the hallmark histological feature of **Acute Eczema**. It refers to **intercellular edema** within the epidermis. As fluid accumulates between keratinocytes, the desmosomes (intercellular bridges) become stretched and prominent, giving the epidermis a "sponge-like" appearance. If the fluid accumulation is severe, it leads to the formation of intraepidermal vesicles. **Analysis of Options:** * **A. Acute Eczema (Correct):** Spongiosis is the defining pathological process in all forms of eczematous dermatitis (atopic, contact, seborrheic). In the acute stage, spongiosis is maximal, often leading to clinical weeping and crusting. * **B. Lichen Planus:** Characterized by **interface dermatitis**. Key findings include "saw-tooth" rete ridges, basal cell degeneration (liquefaction necrosis), and Civatte bodies (apoptotic keratinocytes). * **C. Psoriasis:** Characterized by **regular acanthosis** (test-tube-like elongation of rete ridges), parakeratosis, Munro’s microabscesses (neutrophils in the stratum corneum), and Kogoj’s pustules. * **D. Pemphigus:** Characterized by **Acantholysis** (loss of intercellular connections leading to detached, rounded keratinocytes), not spongiosis. **High-Yield Clinical Pearls for NEET-PG:** * **Spongiotic Dermatitis** is a synonym for Eczema. * **Acanthosis** (thickening of the stratum spinosum) is seen in *Chronic* Eczema (Lichen Simplex Chronicus). * **Acantholysis vs. Spongiosis:** Acantholysis is the *primary failure* of adhesions (Pemphigus); Spongiosis is the *mechanical stretching* of adhesions due to fluid (Eczema). * **Munro’s Microabscess** is a classic "spotter" for Psoriasis on pathology slides.
Question 8: 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 9: What is the most common site of Atopic dermatitis?
- A. Scalp
- B. Elbow
- C. Trunk
- D. Ante-cubital fossa (Correct Answer)
Explanation: **Explanation:** Atopic Dermatitis (AD) is a chronic, relapsing inflammatory skin condition characterized by intense pruritus and a morphology that evolves with age. The distribution of lesions is the most important clinical clue for diagnosis. **1. Why Ante-cubital fossa is correct:** In the **childhood and adolescent/adult phases**, the distribution of AD shifts from extensor surfaces to **flexural surfaces**. The **ante-cubital fossa** (front of the elbow) and the popliteal fossa (behind the knee) are the most characteristic and common sites involved due to sweat retention and friction in these folds, which triggers the "itch-scratch cycle." **2. Analysis of Incorrect Options:** * **Scalp:** While the scalp can be involved in the infantile phase (often confused with seborrheic dermatitis), it is not the most common site overall across the age spectrum. * **Elbow:** The **extensor** aspect of the elbow is typically involved in the **infantile phase** (birth to 2 years) as infants crawl and rub their limbs. However, the flexural involvement (ante-cubital) is more pathognomonic for the classic presentation of AD. * **Trunk:** The trunk can be involved in severe cases (erythroderma), but it is rarely the primary or most common site of localized AD. **3. Clinical Pearls for NEET-PG:** * **Infantile Phase:** Characterized by "Edematous, weepy" lesions on the **face (cheeks)** and extensor surfaces. The diaper area is usually spared. * **Adult Phase:** Characterized by **lichenification** (thickening of skin) primarily on flexures, hands, and eyelids. * **Hertoghe’s Sign:** Thinning of the lateral third of the eyebrows (due to rubbing). * **Dennie-Morgan Fold:** An extra fold of skin under the lower eyelid. * **Treatment of Choice:** Topical corticosteroids (for flares) and topical calcineurin inhibitors (Tacrolimus) for maintenance.
Question 10: Pomphylox affects which area of the body?
- A. Palms and soles (Correct Answer)
- B. Groin
- C. Scalp
- D. Trunk
Explanation: **Explanation:** **Pompholyx**, also known as **Dysidrotic Eczema**, is a specific type of vesicular dermatitis characterized by the sudden eruption of deep-seated, "tapioca-like" vesicles. **1. Why Palms and Soles are correct:** The term "Pompholyx" is derived from the Greek word for "bubble." It exclusively involves the **palms, soles, and lateral aspects of the fingers and toes**. The underlying pathophysiology involves an intense inflammatory response in areas with a thick stratum corneum. Because the skin in these regions is thick, the edema (spongiosis) cannot easily rupture the surface, leading to the formation of tense, itchy, deep-seated vesicles rather than superficial scaling. **2. Why other options are incorrect:** * **Groin:** This area is typically associated with Tinea cruris, Seborrheic dermatitis, or Intertrigo. * **Scalp:** Common involvements include Psoriasis or Seborrheic dermatitis (dandruff). * **Trunk:** This is the classic site for Pityriasis rosea, Pemphigus foliaceus, or Nummular eczema. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** Characterized by "Tapioca-like" vesicles. * **Symptoms:** Intense pruritus (itching) or a burning sensation often precedes the eruption. * **Triggers:** Frequently exacerbated by emotional stress, hot weather (hyperhidrosis), and contact allergens like **Nickel** or Cobalt. * **Management:** High-potency topical corticosteroids are the first-line treatment. * **Differential Diagnosis:** Must be distinguished from Bullous Tinea Pedis (KOH mount needed) and Pustular Psoriasis.
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