Head lice (plural form of louse) or Pediculus humanus capitis, are parasitic insects found on the head and, more rarely, the eyebrows and eyelashes of people. Head lice live close to the scalp and feed on human blood, which causes severe itching. Head lice develop in three stages: nit, nymph, and adult louse. The adult female louse lays up to ten eggs (nits) a day. Nits can be lighter to darker gray color, and they are glued to the hair shaft. Nits hatch into a baby louse (nymph) within one week. The nymph becomes an adult louse in 7 days.
Lice infest regardless of social status and personal hygiene. Lice like CLEAN hair, as it's easier to attach to an uncoated hair shaft. Head lice come from head-to-head contact with an infested person or through contact with their personal belongings. While lice do not jump, hop, or fly, they move by crawling.
