An 80-year-old man presented with a 4-day history of a rash on his abdomen that first developed around his umbilicus and then gradually spread outward. Five days before the onset of the rash, the patient had been working in his garden. He had no associated fevers, chills, fatigue, or myalgias. Which of the following is the most likely diagnosis?
一名80岁男性患者因腹部皮疹就诊，病史为4天，皮疹最初出现在脐周，随后逐渐向外扩散。在皮疹出现前五天，该患者曾在自家花园里劳作。他没有发热、寒战、乏力或肌肉疼痛等伴随症状。以下哪一项是最可能的诊断？
A. Cellulitis蜂窝织炎
B. Contact Dermatitis接触性皮炎
C. Erythema migrans游走性红斑
D. Insect bite昆虫叮咬
E. Tinea Corporis体癣
答案解析：
体格检查发现脐周有红斑，脐部有一个小的灰色突起。使用外科钳子牢固地夹住该突起位于脐基底部的附着点并将其取出后，发现是一只吸满血的成年雌性蜱虫。最终诊断为游走性红斑（erythema migrans），即早期莱姆病的皮肤表现。游走性红斑的诊断主要依靠临床表现，并不总伴有中央消退区或全身症状。
正确答案：C
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