Rash develops at the point where the mite penetrates the skin. Thread like tunnel usually less than 1 cm can be seen as they dig tunnels under the skin.

• 疥虫侵入皮肤后,皮肤表面会出现小丘疹及少于1厘米之线形痕迹,这些就是疥虫所掘出的皮下隧道。