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131237 Medicine

A 19-year-old man develops a rash in the groin area. On examination, it is a large well-demarcated area of tan-brown discoloration around his left inguinal area. There is some scaling of the lesion when brushed with a tongue depressor. (See Figure below) Which of the following is the most appropriate initial diagnostic test?

Apunch biopsy of skin
BTzanck smear
Cpotassium hydroxide (KOH) preparation of scrapings
Dblood culture for fungi
Medicine
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