Dermatitis and Eczema Practice Questions

Q: A child has a rash. His family history is positive for asthma. What could be the most probable diagnosis?

Atopic dermatitis. ***Atopic dermatitis*** - The presence of a rash in a child with a family history of **asthma** strongly suggests atopic dermatitis, as it is part of the **atopic triad** (eczema, asthma, allergic rhinitis). - Atopic dermatitis often presents with **erythematous, pruritic patches** and plaques, commonly affecting flexural areas like the antecubital and popliteal fossae, as well as the face and neck in younger children. *Seborrheic dermatitis* - This condition typically presents with **greasy, yellowish scales** on an erythematous base, often affecting areas rich in sebaceous glands such as the scalp, face (nasolabial folds), and chest. - While it can occur in infants, it does not have the strong association with a family history of asthma seen in atopic dermatitis. *Allergic contact dermatitis* - This rash results from an **exposure to an allergen**, leading to a localized, erythematous, and pruritic eruption, often with vesicles or bullae, at the site of contact. - The history does not provide information about a specific allergen exposure, and while it could produce a similar-looking rash, the family history of asthma points more strongly to atopic diathesis. *Erysipelas* - Erysipelas is a superficial skin infection, usually caused by *Streptococcus pyogenes*, presenting as a **well-demarcated, intensely erythematous, warm, and painful rash** with a raised border. - This is an **acute bacterial infection** and would typically be accompanied by systemic symptoms like fever and chills, which are not mentioned in the child's presentation.

Q: Which of the following organisms has a role to play in Seborrheic dermatitis?

Pityrosporum ovale. ***Pityrosporum ovale*** - **Pityrosporum ovale**, now known as **Malassezia furfur**, is a lipophilic yeast that colonizes the skin and plays a significant role in the pathogenesis of **seborrheic dermatitis**. - Its presence is commonly associated with the inflammatory response seen in seborrheic dermatitis, though the exact mechanism is not fully understood. *Candida albicans* - **Candida albicans** is a common cause of **mucocutaneous candidiasis** and **intertrigo**, but it is not directly implicated in the etiology of seborrheic dermatitis. - While it can cause skin infections, its typical presentation involves erythematous, macerated rashes with satellite lesions in skin folds. *Propionibacterium* - **Propionibacterium acnes**, now known as **Cutibacterium acnes**, is primarily associated with the pathogenesis of **acne vulgaris**. - It plays a role in the inflammation and comedone formation characteristic of acne, not the scaling and erythema of seborrheic dermatitis. *None of the above* - This option is incorrect because **Pityrosporum ovale (Malassezia furfur)** is a well-recognized organism involved in seborrheic dermatitis. - The other organisms listed are associated with different dermatological conditions.

Q: Most common flexural site for atopic dermatitis -

Elbow crease. ***Elbow crease*** - The **antecubital fossa** (elbow crease) and **popliteal fossa** (knee crease) are the **two most characteristic flexural sites** for atopic dermatitis in children and adults. - Both sites are **equally common** and represent classic presentations of flexural eczema. - The constant rubbing, friction, and moisture retention in these areas contribute to skin irritation and the characteristic **lichenification** seen in atopic dermatitis. - In the context of this question asking for "most common," both antecubital and popliteal fossae are considered the primary flexural sites. *Popliteal fossa* - The **popliteal fossa** (behind the knee) is equally as common as the antecubital fossa and is a classic flexural site for atopic dermatitis. - It shares the same pathophysiological mechanisms and clinical presentation as the elbow crease. - Both antecubital and popliteal fossae are mentioned together in standard dermatology texts as the hallmark flexural sites. *Scalp* - While the scalp can be affected by atopic dermatitis, especially in **infants** (as **seborrheic dermatitis** or cradle cap), it is **not a flexural site**. - Scalp involvement typically presents as scaling and erythema, rather than the lichenified plaques characteristic of flexural eczema. *Trunk* - The trunk can be affected by atopic dermatitis with diffuse patches or widespread xerosis, but it is **not a flexural site**. - Flexural areas (skin folds) are the characteristic locations for atopic dermatitis in the flexural pattern.

Q: Most common metal in contact allergic dermatitis is?

Nickel. ***Nickel*** - **Nickel** is the most frequent cause of **metal-induced contact allergic dermatitis**, affecting a significant portion of the population. - It is commonly found in jewelry, belt buckles, buttons, and other everyday metallic objects. *Gold* - **Gold allergy** can occur but is much less common than nickel allergy. - Reactions typically arise from jewelry and may involve **allergic contact dermatitis**. *Silver* - **Silver allergy** is quite rare and often due to impurities or alloys rather than pure silver itself. - Pure silver is generally considered **hypoallergenic**. *Aluminum* - **Aluminum** is generally not a common cause of **allergic contact dermatitis**. - While it can be an irritant in some products (e.g., antiperspirants), true allergic reactions are infrequent.

Q: Characteristic of chronic eczema?

Lichenification. ***Lichenification*** - **Lichenification** is a hallmark of chronic eczema, characterized by thickening of the epidermis with exaggerated skin markings due to persistent rubbing or scratching. - This response reflects the long-term inflammatory and reparative processes in chronically affected skin. *Erythema* - **Erythema**, or redness, is a common finding in both acute and chronic inflammatory skin conditions, including acute eczema, but is not specifically characteristic of chronicity. - While present, it does not distinguish chronic from acute phases as definitively as other features. *Induration* - **Induration** refers to hardening or firmness of the skin, often due to inflammation or infection, and while it can be present in chronic eczema, it's a more general sign and not as specific as lichenification. - It might also suggest other conditions like cellulitis or deep tissue involvement. *Edema* - **Edema**, or swelling, is more prominent in the acute phase of eczema due to vasodilation and increased vascular permeability leading to fluid extravasation. - While some edema can persist, it's a less defining feature of chronic eczema compared to the epidermal changes observed in lichenification.

Q: Which of the following is NOT a feature of atopic dermatitis?

Darier’s Sign. ***Darier's Sign*** - **Darier's sign** is characteristic of **urticaria pigmentosa** (cutaneous mastocytosis), where rubbing a skin lesion causes the formation of an urticarial wheal due to mast cell degranulation - It is **not associated** with the pathogenesis or clinical presentation of **atopic dermatitis** *Dennie-Morgan fold* - **Dennie-Morgan folds** are extra folds or lines in the skin just below the lower eyelids - They are a common clinical sign observed in patients with **atopic dermatitis**, often linked to chronic inflammation and allergic reactions affecting the skin around the eyes *Hertoghe's sign* - **Hertoghe's sign** refers to the thinning or absence of the lateral third of the eyebrows - This sign is often seen in individuals with **atopic dermatitis**, as well as in other conditions like hypothyroidism *Hyperlinearity of palms* - **Hyperlinearity of palms** refers to the exaggerated creases and lines on the palms of the hands - This is a common **stigmata of atopy** and is frequently observed in patients with **atopic dermatitis**, reflecting the underlying predisposition to skin dryness and altered epidermal barrier function

Q: A primigravida female presented with erythematous skin changes and lesions consistent with a severe allergic reaction. Which of the following should be the most appropriate treatment?

Corticosteroids. ***Corticosteroids*** - **Corticosteroids** are the **first-line therapy** for severe allergic reactions due to their potent **anti-inflammatory** and **immunosuppressive** effects. - They help to stabilize mast cell membranes, reducing the release of inflammatory mediators and suppressing the allergic response. *Acitretin* - **Acitretin** is a **retinoid** primarily used for severe **psoriasis** and is **teratogenic**, making it unsuitable for a primigravida and a severe allergic reaction. - Its mechanism of action involves regulating cell proliferation and differentiation, which is not appropriate for acute allergy management. *Psoralen + PUVA* - **Psoralen** combined with **UVA light (PUVA)** is a **phototherapy** treatment used for severe **psoriasis**, **vitiligo**, and **cutaneous T-cell lymphoma**. - It has a slow onset of action and involves photosensitizers, making it inappropriate for the urgent treatment of a severe allergic reaction. *PUVA* - **PUVA** (Psoralen plus UVA light) is a form of **phototherapy** used for chronic skin conditions, not acute allergic reactions. - The mechanism involves psoralen making the skin more sensitive to UVA light, which then inhibits excessive cell growth and immune activity over time.

Q: Which condition is characterized by perioral pallor and Dennie-Morgan folds?

Atopic dermatitis. ***Atopic dermatitis*** - **Perioral pallor** (paleness around the mouth) and **Dennie-Morgan folds** (infraorbital folds) are classic cutaneous manifestations observed in atopic dermatitis. - These features, along with xerosis, lichenification, and eczema, form part of the diagnostic criteria for this chronic inflammatory skin condition. *Chronic actinic dermatitis* - This condition is characterized by an **eczematous eruption** in **sun-exposed areas**, such as the face, neck, and dorsal hands. - It does not typically present with perioral pallor or Dennie-Morgan folds, which are specific to atopic predispositions. *Blood dyscrasia* - Blood dyscrasias are disorders affecting the blood components and can manifest with various skin findings, like **purpura**, **pallor due to anemia**, or **ulcers**. - However, they do not specifically cause perioral pallor in the characteristic pattern seen with atopic dermatitis or Dennie-Morgan folds. *Perioral contact dermatitis* - This condition is an **inflammatory skin response** to a **topical irritant or allergen** applied around the mouth. - It usually presents with erythema, scaling, and sometimes vesicles in the area of contact, rather than generalized perioral pallor or Dennie-Morgan folds.

Q: Most common precipitant of contact dermatitis is?

Nickel. ***Nickel*** - **Nickel** is the most frequent cause of **allergic contact dermatitis**, commonly found in jewelry, belt buckles, and zippers. - Exposure leads to a **Type IV hypersensitivity reaction**, characterized by erythema, itching, and vesiculation. *Gold* - While gold can cause contact dermatitis, it is **far less common** than nickel allergy. - Reactions to gold are often seen with prolonged skin contact, such as with jewelry. *Silver* - **Silver** is a **rare cause** of allergic contact dermatitis. - Allergic reactions to silver are typically observed in individuals with extensive exposure, such as jewelers. *Iron* - **Iron** is **not a common precipitant** of contact dermatitis. - Allergic reactions to iron are exceedingly rare, as iron is an essential element found naturally in the body.

Question 1

A child has a rash. His family history is positive for asthma. What could be the most probable diagnosis?

Accepted Answer

Atopic dermatitis

Answer

Seborrheic dermatitis

Answer

Allergic contact dermatitis

Answer

Erysipelas

Question 2

Which of the following organisms has a role to play in Seborrheic dermatitis?

Accepted Answer

Pityrosporum ovale

Answer

Propionibacterium

Answer

Candida albicans

Answer

None of the above

Question 3

Most common flexural site for atopic dermatitis -

Accepted Answer

Elbow crease

Answer

Popliteal fossa

Answer

Scalp

Answer

Trunk

Question 4

Most common metal in contact allergic dermatitis is?

Accepted Answer

Nickel

Answer

Gold

Answer

Silver

Answer

Aluminum

Question 5

A 25-year-old patient presents with chronic itchy, erythematous skin lesions on the flexural areas that have been recurring since childhood. The patient has a family history of asthma. Which of the following is the most important diagnostic criterion for the most likely diagnosis?

Accepted Answer

Chronic pruritic eczema with typical morphology and distribution

Answer

Personal or family history of atopy

Answer

Elevated serum IgE levels

Answer

Early age of onset (before 2 years)

Question 6

Characteristic of chronic eczema?

Accepted Answer

Lichenification

Answer

Erythema

Answer

Induration

Answer

Edema

Question 7

Which of the following is NOT a feature of atopic dermatitis?

Accepted Answer

Darier’s Sign

Answer

Dennie-Morgan fold

Answer

Hyperlinearity of palms

Answer

Hertoghe’s sign

Question 8

A primigravida female presented with erythematous skin changes and lesions consistent with a severe allergic reaction. Which of the following should be the most appropriate treatment?

Accepted Answer

Corticosteroids

Answer

Psoralen + PUVA

Answer

PUVA

Answer

Acitretin

Question 9

Which condition is characterized by perioral pallor and Dennie-Morgan folds?

Accepted Answer

Atopic dermatitis

Answer

Chronic actinic dermatitis

Answer

Blood dyscrasia

Answer

Perioral contact dermatitis

Question 10

Most common precipitant of contact dermatitis is?

Accepted Answer

Nickel

Answer

Gold

Answer

Silver

Answer

Iron

Dermatitis and Eczema — MCQs

Dermatitis and Eczema — MCQs

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