Basketball player develops black patch on heel. Let’s diagnose.

A 21-year-old man visited his doctor concerned about an asymptomatic blackish lesion that had developed on his left heel 1 week prior, soon after a college basketball tournament. On examination, a stippled, deeply violaceous, and blackish patch with overlying scale was seen on his plantar heel. He had no history of dermatological disease.

What’s the diagnosis?

Use the Differential Builder in VisualDx to help you.

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