A 24-year-old woman presented with a 2-month history of rash on her shins. The rash was asymptomatic and was more prominent in the left leg. It had first appeared during the winter, at which time she had been sitting by an electric heater that was closer to her left leg. Exam was without palpable purpura, subcutaneous nodules, or areas of gangrene. What is the diagnosis?
A. Cryoglobulinemia
B. Cutaneous polyarteritis nodosa
C. Erythema ab igne
D. Livedo reticularis
E. Livedoid vasculitis
答案解析：
正确答案是灼烧性红斑。火性红斑是一种长期暴露在高温下引起的皮肤病。它表现为红斑或色素沉着网状，可发生在身体的任何地方，取决于外部热源的位置。去除直接热暴露后，色素沉着改善。
正确答案：C
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