Red coalescing lesions on the chest

A woman, aged 48 years, complained of a rash on her chest that first appeared rather suddenly two months earlier. The lesions were extremely pruritic and had responded minimally to topical steroids prescribed at an urgent-care center. A review of systems revealed episodic flushing, dizziness, abdominal pain, and diarrhea that seemed to be triggered by alcohol consumption or exercise.

The ...