38-Year-Old With Foot Rash

A 38-year-old man presents to urgent care for a pruritic rash that developed on his feet over the last week. The rash is worse on his left foot than the right. He frequently works out and showers at the gym before going to work. On examination, fine, powdery, scaly plaques are seen on his soles and insteps. He otherwise appears well and has no systemic symptoms.

View the image below and consider what your diagnosis and next steps would be. Resolution of the case is described on the following page.