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寄生于人体的蠕形螨有毛囊蠕形螨(demodexfolliculorum)和皮脂腺蠕形螨(demodex brevis)。D.f寄生于皮肤较为表浅的毛囊部位,常颚体朝毛囊底部,且有群居现象;D.b一般为单条独居生活,寄生于皮肤深部的皮脂腺内。蠕形螨昼夜均可逸出皮肤表面,且以雌螨为主。但D.f与D.b的逸出高峰不同,前者的逸出高峰为10∶00～18∶00,后者的逸出高峰为22∶00～2∶00。蠕形螨作为条件致病寄生虫,对高温、干燥和碱性环境的抵抗力弱,可广泛寄生于健康人群的颜面部、外耳道、头皮、乳头、胸、臂等处的毛囊及皮脂腺,其中以皮脂腺较多的颜面部
Demodex mites parasitic on the body are Demodex folliculorum and demodex brevis. D.f parasitic in the skin is more superficial hair follicle parts, often paw toward the bottom of the hair follicles, and have the phenomenon of population; D.b is generally a single living alone, parasitic in the skin of the deep sebaceous glands. Demodex day and night can escape the skin surface, and mainly female mites. But D.f and D.b escape peak is different, the former escape peak is 10:00 ~ 18:00, the latter escape peak is 22:00 ~ 2:00. Demodex as a pathogenic parasite, its resistance to high temperature, dry and alkaline environment is weak, can be widely parasitic on the face of the healthy population, external auditory meatus, scalp, nipple, chest, arm and other hair follicles and sebaceous glands, which Sebaceous gland with more facial