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Treating Head Lice

Pediatrics Expert Advice from Henry Bernstein, M.D.

Q: How can I get rid of head lice? I have tried everything. Please help me.

A: Let's first discuss what head lice (pediculosis capitis) are. The female human head louse lives on the scalp and lays eggs at the base of the hairs. Nits are these eggs attached to the hair base near the scalp. Once formed, the eggs hatch in a week or so and grow to adult forms a week or two after that. They make the scalp extremely itchy, and you may be able to see the nits in your child's scalp, especially around the ears and just above the neck. Lice spread from person to person by contact with hair and with clothing, hairbrushes, and accessories like headbands or ponytail holders.

Normal, healthy children get lice; they needn't have poor hygiene. Be sure that head lice are really what you are dealing with, because it's not always easy to make the diagnosis. Young girls tend to get lice most often, but they are also the group that is most often misdiagnosed. Other insects, dandruff, scabs on the scalp, or plugs in hair follicles are often mistaken for lice.

Treatment generally includes the application of permethrin cream rinse, which can be bought over the counter. Apply it to the hair, leave it on for 10 minutes, then rinse it out. Because it does not kill all of the eggs in a single application, it should be used again in 7-10 days. Then use a fine comb on the hair to remove the nits. Clothing and sheets should be laundered in hot water or dry cleaned, and hairbrushes should be replaced or soaked in permethrin and then boiled. All household contacts should also be treated for lice at the same time.

Assuming you have done all of these things, most treatment failure is due to repeat infections from household contacts, clothing, or hair-care items. A stronger permethrin solution or a lindane shampoo may be suggested. If the condition doesn't improve, have your child evaluated by her doctor.

Hank Bernstein
Children's Hospital

More on: Expert Advice

Henry Bernstein, M.D., is currently the associate chief of the Division of General Pediatrics and director of Primary Care at Children's Hospital, Boston. He also has an academic appointment at Harvard Medical School.


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