chig·ger / ˈchigər/ (also jigger) • n. 1. a tiny mite (genus Trombicula, family Trombiculidae) whose parasitic larvae live on or under the skin of warm-blooded animals, where they cause irritation and dermatitis. 2. another term for chigoe.

chigger (harvest mite or red bug) Tiny, red larva of some kinds of mites found worldwide. Adults lay eggs on plants and hatched larvae find an animal host. Length: 0.1–16mm (0.004–0.6in). Order Acarina; family Trombiculidae.