It is the size of a sesame seed. An adult louse can live 30 days on a person s head. Head lice do not jump from one person to another. By lying on a bed, couch, pillow, carpet, or stuffed animal that has been used by an infested person. Itching Tickling feeling of something moving in the hair.
Sores can develop from scratching the scalp.
The louse s saliva and feces may sensitize people to their bites, thereby exacerbating the irritation and increasing the chance of secondary infection from excessive scratching. How Head Lice Infestation Is Diagnosed Observation of nits, nymphs, or adult lice on the head of an individual. If nits are observed inch from the scalp, the infestation is probably an old one and does not need treating. How To Prevent Infestation of Head Lice Do not share hats, combs or brushes. Avoid head to head contact with infected people.