Head lice are parasitic insects that normally live in the scalp and derive nourishment from human blood. An infestation of head lice is especially common among young children, although adults may develop the condition.
Head lice undergo two stages before maturing into adult insects. Lice eggs are called nits, while hatchlings are known as nymphs. The University of Lincoln-Nebraska website includes photos of a nit attached to a hair shaft and a nit with a dead embryo. Healthline features an image of nymphs and adult head lice.Learn more about Skin Conditions