患者 ,男 ,2 5岁 ,农民 ,左小腿经久不愈溃疡 2年余。 2年前无明显诱因于左小腿下 1 3处外测出现一红色斑疹 ,约蚕豆大小 ,伴瘙痒 ,搔抓皮疹后 ,出现丘疹、水疱、渗液、糜烂和结痂 ,到个体诊所诊治 ,皮损愈合 ,遗留稍硬的角化斑块及暗褐色色素沉着 ,仍感皮损处瘙痒。经搔抓及自 Patient, male, 25 years old, farmer, left leg less protracted ulcers for more than 2 years. Two years ago there was no obvious cause of a red rash outside the left lower leg at 13 sites. About the size of the faba bean, with pruritus, after the rash, there were papules, blisters, exudates, erosions, and scabs. They went to individual clinics for treatment. The skin lesions healed, leaving a slightly harder keratinized plaque and dark brown pigmentation, still feeling itchy skin lesions. After scratching and