Thumbnail squeezing methodHuman Demodex mites live in the hair follicle and sebaceous glands of the facial skin. I introduce a thumbnail squeezing method to evaluate the density of Demodex mites. The density of Demodex is expressed as mites/cm2. With a proper cut-off value, Demodex infestation can be defined.大拇指指甲擠壓檢驗蠕形蟎蟲法人類蠕形蟎蟲主要生活於臉部毛囊和皮脂腺中,以大拇指指甲擠壓臉部皮膚,可以把毛囊內的蠕形蟎蟲擠出來,收集擠出物於顯微鏡下觀察,可以計數蟎蟲數量,以一平方公分為擠壓面積,可以得到蟎蟲密度,據以判斷是否有蠕形蟎蟲感染。