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Alopecia areata — USMLE Step 3 MCQ

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ModerateAmbulatory Medicine / Primary CareAlopecia areataUSMLE Step 3

A 28-year-old woman has two smooth circular patches of hair loss on the scalp. There is no scaling or scarring. Nail pitting is present. Which of the following is the most likely diagnosis?

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Correct answer: D — Alopecia areata

Smooth nonscarring patches of hair loss with nail pitting suggest autoimmune alopecia areata.

Reference: American Academy of Dermatology alopecia guidance