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</div><div><span>Head lice</span></div></div>
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</a><h1 class="with-also" itemprop="name">Head lice</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Head lice are tiny insects that live on the skin covering the top of your head (scalp). Head lice may also be found in the eyebrows and eyelashes.</p><p>Lice spread by close contact with other people.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>Head lice infect hair on the head. Tiny eggs on the hair may look like flakes of <a test="test" href="./000963.htm">dandruff</a>. However, instead of flaking off the scalp, they stay in place.</p><img title="Head lice" alt="Head lice" src="//medlineplus.gov/ency/images/ency/fullsize/23226.jpg" class="img-e" itemprop="image"/><p>Head lice can live up to 30 days on a human. Their eggs can live for more than 2 weeks.</p><p>Head lice spread easily, particularly among school children ages 3 to 11 years. Head lice are more common in close, overcrowded living conditions.</p><p>You can get head lice if:</p><ul><li>You come in close contact with a person who has lice.</li><li>You touch the clothing or bedding of someone who has lice.</li><li>You share hats, towels, brushes, or combs of someone who has lice. </li></ul><p>Having head lice causes intense itching but does not lead to serious medical problems. Unlike body lice, head lice never carry or spread diseases.</p><p>Having head lice does not mean the person has poor hygiene or low social status.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Symptoms of head lice include:</p><ul><li>Very bad itching of the scalp</li><li>Small, red bumps on the scalp, neck, and shoulders (bumps may become crusty and ooze)</li><li>Tiny white specks (eggs, or nits) on the bottom of each hair that are hard to get off </li></ul><img title="Lice, head - nits in the hair with close-up" alt="Lice, head - nits in the hair with close-up" src="//medlineplus.gov/ency/images/ency/fullsize/2437.jpg" class="img-e" itemprop="image"/></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>Head lice can be hard to see. You need to look closely. Use disposable gloves and look at the person's head under a bright light. Full sun or the brightest lights in your home during daylight hours work well. A magnifying glass can help.</p><p>To look for head lice:</p><ul><li>Part the hair all the way down to the scalp in very small sections.</li><li>Examine the scalp and hair for moving lice and eggs (nits).</li><li>Look at the whole head in the same way.</li><li>Look closely around the top of the neck and ears (the most common locations for eggs). </li></ul><p>Both children and adults should be treated right away if any lice or eggs are found.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>Lotions and shampoos containing 1% permethrin (Nix) often work well. You can buy these medicines at the store without a prescription. If these products do not work, a health care provider can give you a prescription for stronger medicine. Always use the medicines exactly as directed. Using them too often or in the wrong way can cause side effects.</p><p>To use the medicine shampoo:</p><ul><li>Rinse and dry the hair.</li><li>Apply the medicine to the hair and scalp.</li><li>Wait 10 minutes, then rinse it off.</li><li>Check for lice and nits again in 8 to 12 hours.</li><li>If you find active lice, contact your provider before doing another treatment.</li></ul><p>You also need to get rid of the lice eggs (nits) to keep lice from coming back.</p><p>To get rid of nits:</p><ul><li>You can use products that make the nits easier to remove. Some dishwashing detergents can help dissolve the "glue" that makes the nits stick to the hair shaft.</li><li>Remove the eggs with a nit comb. Before doing this, rub olive oil in the hair or run the metal comb through beeswax. This helps make the nits easier to remove.</li><li>Metal combs with very fine teeth are stronger and work better than plastic nit combs. These metal combs are easier to find in pet stores or on the Internet.</li><li>Comb for nits again in 7 to 10 days.</li></ul><p>When treating head lice, wash all clothes and bed linens in hot water with detergent. This also helps prevent head lice from spreading to others during the short period when head lice can survive off the human body.</p><p>Ask your provider if people who share bedding or clothes with the person who has head lice need to be treated as well.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Most of the time, lice are killed with the proper treatment. However, lice can come back if you do not get rid of them at the source.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Possible Complications</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Some people will develop a skin infection from scratching. Antihistamines can help ease itching.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>Contact your provider if:</p><ul><li>You still have symptoms after home treatment.</li><li>You develop areas of red, tender skin, which could signal an infection. </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>Some of the steps to prevent head lice are:</p><ul><li>Never share hair brushes, combs, hair pieces, hats, bedding, towels, or clothing with someone who has head lice.</li><li>If your child has lice, be sure to check policies at schools and daycare. Many places do not allow infected children to be at school until the lice have been completely treated.</li><li>Some schools may have policies to make sure the environment is clear of lice. Cleaning of carpets and other surfaces often helps prevent spread of all types of infections, including head lice.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Pediculosis capitis - head lice; Cooties - head lice</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/17207t.jpg" alt="Head lice" title="Head lice" class="side-img"/><a href="../imagepages/17207.htm">Head lice</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Burkhart CN, Burkhart GG, Morrell DS. Infestations. In: Bolognia JL, Schaffer JV, Cerroni L, eds. <em>Dermatology</em>. 5th ed. Philadelphia, PA: Elsevier; 2024:chap 84.</p><p>James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM. Parasitic infestations, stings, and bites. In: James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM, eds. <em>Andrew's Diseases of the Skin Clinical Dermatology</em>. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 20.</p><p>Seifert SA, Dart RC, White J. Envenomation, bites, and stings. In: Goldman L, Cooney KA, eds. <em>Goldman-Cecil Medicine</em>. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 98.</p></div></div></section>
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<div id="section-version" class="section-body"><p>Updated by: Charles I. Schwartz, MD, FAAP, Clinical Assistant Professor of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, General Pediatrician at PennCare for Kids, Phoenixville, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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