1临床资料患者男,32岁。阴囊、大腿内侧环形皮疹,肛周扁平丘疹2周。2周前阴囊、大腿内侧出现红斑,肛周出现小丘疹,逐渐增大增多,皮疹伴轻度瘙痒及疼痛。就诊时否认有婚外性生活史,否认有外阴皮肤破溃史,无食物及药物过敏史。系统检查未见异常。皮肤科情况:阴囊皮肤见大小不等的浸润性环形红斑,中央呈暗红色,表面少许粘着性鳞屑,边缘稍堤状隆起;双 1 Clinical data Patient male, 32 years old. Scrotum, thigh ring rash, perianal flat papules for 2 weeks. 2 weeks ago, the scrotum, erythema inside the thigh, perianal papules, gradually increased, rash with mild itching and pain. Denied having extramarital sex life history at the time of treatment, denied the history of vulva skin ulceration, no history of food and drug allergy. No abnormal system check. Dermatology: scrotal skin see infiltration of varying sizes of annular erythema, the center was dark red, a little sticky scales on the surface, the edge slightly dike-like bulge; double