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Plaque psoriasis — ABFM Board MCQ

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ModerateDermatologyPlaque psoriasisABFM Board

A 58-year-old woman has sharply demarcated erythematous plaques with silvery scale on the elbows and knees. Nail pitting is present. She has no fever or skin pain. Which of the following is the most likely diagnosis?

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Correct answer: C — Psoriasis

Chronic well-demarcated plaques with silvery scale on extensor surfaces and nail pitting are classic for plaque psoriasis. Cellulitis would be painful, warm, acute, and unilateral.

Reference: American Academy of Dermatology Psoriasis Guideline