This form molts into slightly larger nymphs before molting into an adults. Larvae and nymphs may often be found in short burrows or hair follicles. They look similar to adults, only smaller. Adults are round, sac-like eyeless mites. Females are 0.3 to 0.4 mm long and 0.25 to 0.35 mm wide.
Males are slightly more than half that size.
Mating occurs on the skin surface. Afterward, the impregnated female will burrow into the skin and spend the remaining 2 months of her life in tunnels under the surface of the skin. Males are rarely seen. They make a temporary gallery in the skin before mating. Scabies mites are distributed worldwide, affecting all races and socioeconomic classes in all climates.