Derm Dx: A reddish rash on the scrotum

A 38-year-old man presents complaining of incessant burning and itching of his scrotum. The condition has been present for several months and was diagnosed elsewhere as a yeast infection. Oral fluconazole had no effect, and topical econazole caused increased irritation and could not be tolerated. The patient denies a history of diabetes or sexually transmitted disease. He admits to increased ...