One reason why kids get lice more often than teens is because kids play together closely and often share more stuff. For specific medical advice, diagnoses, and treatment, consult your doctor. Nits look sort of like dandruff, except they don't brush or fall off as easily as dandruff. Your doctor can recommend a medicated shampoo, cream rinse, or lotion to kill the lice. Lice can live up to 2 days without feeding on a person, so you also can get lice from pillowcases, sheets, blankets, sleeping bags, and other bedding.
Lice spread in schools and other group settings like camp or even slumber parties because these are places where people are in close contact.
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You can't get lice from a pet. If someone scratches a lot, it may lead to skin irritation and even infection. Some people with lice also get a rash of small red bumps from scratching. Lice attach their nits to pieces of hair, close to the scalp. Lice are insects, so the treatments for lice are basically insecticides or pesticides.