Head lice are parasitic insects that live in the hair and scalp of humans. The scientific name for head louse is Pedicels human’s capitals. Another name for infestation with head lice is epiclesis. Head lice develop in three forms: nits, nymphs, and adults.


Nits: Nits are head lice eggs. They are hard to see and are often mistaken for dandruff or droplets of hairspray. Nits are found firmly attached to the hair shaft. They are oval and usually yellow to white. Nits take about 1 week to hatch.

Nymphs: Nits hatch into nymphs. Nymphs are immature adult head lice. Nymphs mature into adults about 7 days after hatching.

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To live, nymphs must feed on blood.  Adults: An adult louse is about the size of a sesame seed, has six legs, and is tan to grayish- white. In persons with dark hair, adult lice will look darker. Adult lice can live up to 30 days on a person’s head. To live, adult lice need to feed on blood. If a louse falls off a person, it dies within 2 days.