An investigation into the patient’s unusual dermatologic symptoms identified an underlying autoimmune disease. Fourteen days after breast-reduction surgery, the patient, a 25-year-old white woman, was completely recovered. But at 20 days after surgery, she had bilateral mammary ulcerative lesions and was admitted to another hospital. The lesions were painless, and she was afebrile. Negative pressure wound therapy failed to accomplish secondary intention healing. For 6 weeks, she was treated with oral prednisolone, 1 mg/kg/day, and hyperbaric oxygen therapy, but these had limited effect.