A rash on the chest and back

Case #1

A 52-year-old white man with a history of hypertension and diabetes presents with an intermittent, ongoing blistering rash on his chest and back that has persisted for more than 3 years. The patient reports that the rash 
was sometimes irritated and painful, and he denies pruritus. He had tried over-the-counter antifungal creams for several months with no improvement. On ...