Fragile, bullous lesions on the trunk of a child

An 8-year-old African-American boy presents with a 3-day history of fever, pain, and a rash on his trunk. On examination, the patient has several fragile, bullous lesions on his trunk, many of which have eroded, exposing erythematous, annular lesions. The patient is febrile and shaking in the office, and he appears to be in pain. He has no other relevant ...