临床资料患儿,女,2岁6个月。因头顶部皮肤被叮咬伴瘙痒、刺痛1 d,于2014年7月就诊。患儿1 d前曾在杨树下玩耍,随后家长发现其头顶部偏右侧有一灰色小结节,质硬、可移动,伴有瘙痒和刺痛。体格检查:一般情况好,系统检查未见异常。皮肤科情况:头顶偏右侧可见一灰白色结节,约绿豆大小,周围皮肤轻度红肿,无触痛。皮肤镜检查:见有一虫体口器刺入皮肤,伤口周围红肿(图1a)。当日于 Clinical data of children, female, 2 years and 6 months. The skin on the top of the head was bitten by itching and stinging for 1 day and was visited in July 2014. The child had been playing under the poplar trees 1 d before the parents found a small, gray nodule on the right side of the top of his head that was hard and mobile with pruritus and stinging. Physical examination: the general situation is good, the system check no abnormalities. Dermatology: a grayish white nodules visible on the right side of the head, about the size of green beans, mild swelling around the skin, no tenderness. Dermatoscopy: See a body piercing the skin mouth, wound around the swelling (Figure 1a). The same day