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1 Head Lice Bites: Itchy, Red Bumps Lice bites appear as little red bumps on the scalp, head, and shoulders, and cause the skin to become inflamed and intensely itchy. 2  If you scratch your lice bites, it may cause them to become infected.
One nit can hatch after eight to twelve days and become a nymph. A female nymph will become an adult in three to five days. A louse will live for about thirty days, so they can make lots of lice in their lifetime. When a louse eats, their bite leaves their saliva in your skin. That's what makes you itch. Most scientists don't think head lice can give you a disease. But if you scratch your head enough, it can cause an infection.