Professional and Linguistic Assessments Board (PLAB) Practice Exam

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What is the defining feature of seborrhoeic dermatitis?

Presence of pustules
Oily, scaly skin
Reddish patches
Itchy blisters

The correct answer is: Oily, scaly skin

Seborrhoeic dermatitis is characterized primarily by oily, scaly skin, particularly in areas rich in sebaceous (oil-producing) glands such as the scalp, face, and upper back. This condition is related to the proliferation of yeast that lives on the skin, as well as the response to inflammation in sebaceous gland activity. The oily and scaly features can often present as flaky, yellowish scales on the scalp (commonly referred to as dandruff) or greasy patches on the face. This distinguishing characteristic separates seborrhoeic dermatitis from other dermatological conditions that may involve redness or eruptions but do not manifest this specific combination of oiliness and scaling. While reddish patches can occur in various skin conditions, and pustules or blisters may indicate different dermatological issues (like acne or eczema), they are not defining characteristics of seborrhoeic dermatitis itself.