Anyone who comes in close contact with someone who already has head lice, contaminated clothing, and other belongings. Girls get head lice more often than boys, women more than men. In the United States, African-Americans rarely get head lice.
Nits are head lice eggs.
They are hard to see and are often confused for dandruff or hair spray droplets. Nits are found firmly attached to the hair shaft. They are oval and usually yellow to white. Nits take about 1 week to hatch. The nit hatches into a baby louse called a nymph.