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Although lice and their nits are small, they are visible to the naked eye. Head lice can be white, brown, or dark gray. They are most often found in the hair at the back of the neck or behind the ears. The nits are round or oval specks that are tightly glued to hairs near the scalp. If you try to slide the nits off, they won't budge.
Use nit combs or cat flea combs to remove the lice and eggs. Because eggs can hatch for up to 10 days after they are laid, comb hair daily for two weeks after you find the last live head lice, to remove any young that have emerged.dult head lice are about 1/8 inch long, grayish, flattened, and wingless. Their legs are claw-like, designed to hold onto hair. These lice excrete partially digested blood which can appear as 'black dandruff'. Lice eggs, commonly referred to as nits, are whitish, oval and the size of a pinhead (1/30 inch long).