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?

• Acral lentiginous melanoma
• Atypical nevus
• Talon noir
• Tinea nigra

Use the Differential Builder in VisualDx to help you.