Head lice are six-legged parasitic insects that feed on human blood. There are three main types of lice that affect humans: head lice, body lice and pubic lice. Lice infestations are typically treated with over-the-counter drugs, soaps and shampoos.
Lice are spread when an infested person comes into close contact with other people or shares an item of clothing with them. Head lice are commonly found on the nape of the neck and behind the ears, while body lice tend to live and lay their eggs in clothing. Head lice and pubic lice do not carry diseases, but body lice can carry diseases such as typhus and trench fever.