I’m a pediatrician and a mom - here’s how to treat lice without stigma
Headlice have a high ick factor, but thankfully but these insects aren't dangerous and don't spread disease. Catherine DELAHAYE/Photononstop via Getty Images Four words that parents in the classroom group chat dread to read: ‘My kid has lice.’ Head lice ( Pediculus humanus capitis ) are parasites that primarily infest children in childcare, preschool or elementary school.
Head lice (Pediculus humanus capitis) are tiny parasites that live on human scalps, feeding on blood. They are about 2-3 millimeters long—roughly the size of a sesame seed—and can be gray-tan in color. Unlike common misconceptions, head lice do not spread diseases and are not a sign of poor hygiene. They spread primarily through direct head-to-head contact, such as during close play or naps in school settings. Lice cannot jump or fly, and they cannot survive more than 48 hours away from a human scalp. Female lice lay eggs near the scalp, attaching them firmly to hair shafts with a glue-like substance. These eggs take 8 to 9 days to hatch, and the newly hatched lice mature in about 9 to 12 days. Lice have been companions to humans since ancient times, and they can infest all hair types, regardless of texture or cleanliness.
Head lice spread most commonly through direct head-to-head contact, such as when children sit closely together or share a bed during naps. While lice can also spread through shared items like hats, hairbrushes, or scarves, this route is less common because lice cannot live long without a human host. The Centers for Disease Control and Prevention (CDC) notes that lice do not spread through pets, swimming pools, or other environmental factors. Schools often see outbreaks because children frequently engage in head-to-head activities. Despite myths, lice are not linked to hygiene levels, and anyone can get them. The key to prevention is avoiding direct head contact and not sharing personal items like combs or hats.
The most common sign of a lice infestation is frequent scratching of the scalp, which occurs due to an allergic reaction to lice saliva. However, this itchiness may not appear immediately. It can take 4 to 6 weeks for a child to develop sensitivity to lice saliva, meaning the infestation may have been present for weeks before symptoms appear. To confirm lice, parents should look closely at the scalp for live lice, which are fast-moving and avoid light. Eggs, also called nits, are often found behind the ears or at the nape of the neck. Unlike dandruff, nits are firmly attached to hair shafts and do not flake off. Empty nits may remain in the hair for weeks even after treatment, so their presence does not always indicate an active infestation.
Several over-the-counter treatments are approved by the U.S. Food and Drug Administration (FDA) and are safe for children. 1% permethrin (brand name Nix) is a lotion or cream rinse that kills live lice but not eggs, so it must be reapplied after 9 to 10 days. Pyrethrins + piperonyl butoxide (brand name Rid) works similarly and is safe for children 24 months and older. Ivermectin 0.5% lotion kills both live lice and newly hatched lice, so a single application is often sufficient for children older than 6 months. After treatment, use a fine-toothed comb to remove dead lice and eggs. Avoid home remedies like mayonnaise or oil, as they have not been proven effective. If over-the-counter treatments fail, prescription options like malathion or spinosad are available.
Historically, many U.S. schools enforced "No Nit" policies, which excluded children from school if any lice eggs or nits were found. However, the American Academy of Pediatrics (AAP) and the CDC oppose these policies, stating they are unnecessary and contribute to stigma. Current guidelines recommend that children with lice should not be sent home early from school. Instead, schools should notify parents so treatment can begin, and the child can continue attending while avoiding head-to-head contact and sharing personal items. Schools should not check for nits after treatment, as empty nits can persist for weeks without indicating an active infestation. This approach helps reduce embarrassment and keeps children in school.
To prevent re-infestation, wash clothing, bedding, hats, and toys that came into contact with the child’s head in the past two days using hot water and high heat drying. Vacuum furniture and carpets to remove fallen hairs. Items that cannot be washed should be sealed in plastic bags for two weeks to kill any remaining lice or eggs. Lice do not survive long off the scalp, so deep cleaning is less critical than treating the infestation itself. To reduce the risk of spreading lice, encourage children to avoid sharing personal items like combs, hats, or scarves. Regular checks for lice, especially after outbreaks in school, can help catch infestations early.
