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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.
This depends on the degree of your infestation and also on you. Some people are very allergic to the saliva of adult lice who bite us, and their scalp will begin to itch right away. Some people are not allergic so they will feel itching only days or weeks (up to 6 weeks) after the first louse came to their head.