Derm Dx: Rash on the Lower Abdomen and Groin

A 56-year-old moderately obese woman is referred for evaluation and treatment of a rash affecting her lower abdomen and groin. The dermatitis has been present for approximately 1 year and occasionally burns and itches. Topical therapy with econazole cream was ineffective. Oral prednisone resulted in lightening, but the condition flared as the dose was tapered and the treatment discontinued. Examination ...