Lice are tiny insects that live on and crawl through the hair. They are gray, brown, or black and can be difficult to see. It takes about 6 days for the nits to hatch.
Nits are easier to see than lice.
Nits are oval shaped and most often can been seen in the hair behind the ears or near the neck. Head lice themselves are not a health hazard or a sign of uncleanliness, and are not responsible for the spread of any disease. Itching of the scalp is the most common symptom. Scratching can lead to skin sores and skin infections. Lice can be spread by wearing another person's hat or clothing, by using another person's comb, brush, or bedding, or by placing clothing worn by someone who has lice in a shared clothing storage compartment, locker, or a cloak room.