本文报告3例外耳道皮肤蠕形螨感染,主要临床表现为局部皮肤持续性发痒,伴轻度皮损征象,分泌物呈豆腐渣样。镜下查见毛囊蠕形螨。灭滴灵治疗效果满意。作者还对本病的病理改变,感染途径,诊断要点及预防措施进行了讨论。 This article reports 3 cases of demodex infection of the skin of the external auditory meatus, the main clinical manifestations of persistent itching on the local skin, with signs of mild lesions, rubbish residue was like. Microscopy see hair follicle mites. Metronidazole treatment satisfactory results. The author also discussed the pathological changes of the disease, the route of infection, the diagnosis points and preventive measures.