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Lice are tiny, wingless insects that feed on human blood. Lice spread from person to person through close contact and by sharing belongings.
There are three types of lice:
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Common signs and symptoms of lice include:
Lice feed on human blood and can be found on the human head, body and pubic area. The female louse produces a sticky substance that firmly attaches each egg to the base of a hair shaft. Eggs hatch in 6 to 9 days.
You can get lice by coming into contact with either lice or their eggs. Lice can't jump or fly. They spread through:
Use drugs that treat lice only as directed. Applying too much can cause red, irritated skin.
Head lice treatment may involve:
Nonprescription products. Shampoos containing permethrin (Nix) are usually the first option used to combat lice. Permethrin is a synthetic version of pyrethrin, which is a chemical compound extracted from the chrysanthemum flower. Permethrin is toxic to lice. Follow the directions closely when usin...
It's difficult to prevent the spread of head lice among children in child care and school settings. There's so much close contact among children and their belongings that lice can spread easily. The presence of head lice isn't a reflection of hygiene habits. It's also not a failure on the parent if a child gets head lice.
Some nonprescription products claim to repel lice. But more research is needed to prove their safety and effectiveness.
Many small studies have shown that ingredients in some of t...
For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.
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