Derm Dx: Itchy, light-brown patches in the groin

A 65-year-old obese male with a history of hypertension and hyperlipidemia complains of light-brown patches, accompanied by itching in the groin that has been present for four months. The patient’s current medications include atorvastatin (Lipitor) and hydrochlorothiazide. He lives by himself and reports drinking about four beers a day. He has not had sexual relations in five years.

Physical exam ...