The head louse, or Pediculus humanus capitis , is a parasitic insect that can be found on the head, eyebrows, and eyelashes of people. Head lice feed on human blood several times a day and live close to the human scalp. Head lice are not known to spread disease. Head lice are found worldwide. In the United States, infestation with head lice is most common among pre-school children attending child care, elementary schoolchildren, and the household members of infested children.
Pediculus humanus capitis , the head louse, is an insect of the order Psocodea and is an ectoparasite whose only host are humans. The louse feeds on blood several times daily and resides close to the scalp to maintain its body temperature. Eggs: Nits are head lice eggs. They are hard to see and are often confused for dandruff or hair spray droplets. Nits are laid by the adult female and are cemented at the base of the hair shaft nearest the scalp.
Nits are lice eggs , so the presence of them in your hair suggests that a louse has been there at some point, and it may still be. They can be hard to find. They also could have laid the eggs before crawling to another head or fallen out when you brushed your hair. In the best-case scenario, you could also be mistaking nits for dandruff. They look similar and are both typically found close to the scalp.
Back to Health A to Z. Head lice and nits are very common in young children and their families. They do not have anything to do with dirty hair and are picked up by head-to-head contact. You can do this by combing their hair with a special fine-toothed comb detection comb. You can buy these online or at pharmacies.