A 41-year-old man presented with a pruritic rash between his toes that had been present for at least 2 months. Treatment with a nonprescription antifungal cream had not led to significant improvement.

Our young athlete had tinea pedis, also known as “athlete’s foot” or “foot ringworm.” Tinea pedis affects the toes and feet and is the most common fungus infection. Dermatophyte infections, such as ...