Name That Rash!

Source: UpToDate, VisualDx

A healthy young adult patient presents with an itchy rash in their groin, which has been present for 2 weeks. The rash started as a single lesion (arrow), which then seemed to multiply. The remaining history is unrevealing—no recent illness, no prior medical issues, no new exposures, and no sexual activity. 

What’s the diagnosis? What causes it? How do we treat it? 

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