Head lice in children: how to clear them properly and stop them coming back

How do I get rid of head lice in my child quickly?

The short answer is to choose one of two proven methods and see it through to the end. The first is a pharmacy product made for head lice, applied to the hair as the leaflet directs and repeated about a week later because some eggs can survive the first round. The second is wet combing with a fine-toothed lice comb on conditioner-soaked hair, every four days for about two weeks. With either method, you check the hair once treatment is finished to confirm there are no live lice left.

Head lice (Pediculosis capitis) are small insects about the size of a sesame seed that live on the scalp and feed on tiny amounts of blood. The female glues her eggs, called nits, firmly to the base of the hair shaft close to the skin. The eggs hatch in about a week, and the young lice grow and start breeding within days. That is why a single treatment session usually is not enough, and it is the detail many parents miss.

What delays treatment most often in our region is not a lack of products, it is embarrassment. Many parents find lice, treat the child quietly with a neighbour's recipe, and tell neither the school nor the grandparents, and the lice come back two weeks later from another child. Correct treatment, together with checking everyone the child is close to, actually ends the problem instead of letting it go round in circles.

Before you buy anything, make sure you are seeing live, moving lice and not dandruff or old empty egg cases. White nits sitting well away from the scalp on their own do not mean the infestation is still active, because they are usually shells that hatched weeks ago. A live louse is the evidence that justifies treatment.

Do head lice mean my child is not clean?

No, and this is the most important sentence on this page. Head lice spread mainly through head-to-head contact, when children play close together, share a bed, or lean their heads together over a phone or a book. Lice cannot fly or jump, they crawl from one hair to the next. They infest clean hair washed every day just as easily as any other hair, and they turn up in the most careful households.

Studies from our region show how widespread they are. A 2012 study in the Eastern Mediterranean Health Journal examined 1,550 primary school children in Mafraq Governorate, Jordan, and found head lice in 26.6 percent of them, including 34.7 percent of girls and 19.6 percent of boys. A 2018 study of 500 pupils in southern Jordan found lice in 20.4 percent. In practice, almost every classroom has several affected children at any given time.

It is true that those studies linked infestation to crowded homes, shared combs and scarves, and less frequent hair washing. These are factors that make it easier for lice to pass between people, not proof that lice are a punishment for poor hygiene. Girls are affected more because long hair, braids and close play let lice cross over more easily, not because girls are less clean.

Once you treat lice like any other school infection, such as a cold, it becomes much easier to tell the teacher and the parents of your child's friends so they can check their own children. That simple step does more than anything else to stop lice coming back into your home after all your effort.

How can I tell if my child really has head lice?

An itchy scalp, especially behind the ears and at the nape of the neck, is the best known sign. But itching may only start weeks after the lice arrive, because it is an allergic reaction to louse saliva, and some children never itch at all. So do not wait for itching before you check, and check your child whenever the school sends a note about lice in the class.

The most reliable way to check is detection combing on wet hair. Looking with the eyes alone is misleading, because lice move quickly away from light and hide close to the scalp. Wet the hair, add some ordinary conditioner, then draw the lice comb from the roots to the tips and wipe it on a white tissue after every stroke. If you find at least one live louse, your child has an active infestation that needs treating.

Tell nits apart from dandruff. Dandruff brushes off easily and falls onto the shoulders, while a nit is glued to the hair and only moves if you slide it along the shaft with your fingernails. Live eggs sit very close to the scalp, within about a centimetre, while eggs further out along the hair are usually empty.

A metal lice comb with closely spaced teeth is sold in most pharmacies for very little, and it is the single most useful thing you can buy. The cheap plastic combs that sometimes come in treatment packs can have teeth too far apart to catch young lice.

Wet combing step by step

Wet combing uses no chemicals at all, which is why it suits very young children, pregnant women, and children with allergies or asthma. Conditioner makes lice sluggish and unable to grip, so the comb lifts them out easily. The secret is repetition: each session removes the lice that are there, and the next session catches any that hatched from eggs you missed.

The NHS recommends combing on days 1, 5, 9 and 13, then a final check on day 17. Short hair takes around ten minutes, while long or curly hair can take half an hour. Sit your child in front of a cartoon or give them a story to read, because a calm session works far better than one spent wriggling and crying.

Be honest with yourself about the effort. Combing alone needs patience and commitment. A 2022 review in Drugs in Context concluded that wet combing is time consuming and should not be the only method for the general population, but that it is the preferred option for children under two. If you know you will not manage four full sessions, a pharmacy product combined with combing may suit your family better.

Even if you use a pharmacy product, the comb is still useful for removing eggs and dead lice, and for confirming a few days later that treatment worked. Many cases of lice that will not go away are really a successful treatment that was never checked, or a fresh infestation from a sibling or cousin nobody examined.

Pharmacy lice treatments: how they are generally used

Pharmacies across the region sell several kinds of head lice product, many of them without a prescription. Some kill lice by attacking their nervous system, such as permethrin and the pyrethrins. Others coat the louse so it suffocates or cannot regulate its water, such as dimeticone, a silicone oil that the skin does not absorb. There are further options that a doctor usually prescribes if the first treatment fails.

The general rule for most products is that they are applied to the hair, left on for the time stated in the leaflet, then rinsed off, and the treatment is repeated after seven to ten days to kill lice that hatched from surviving eggs. Follow the leaflet exactly. Do not use more product or leave it on longer in the belief that it will work better, and do not use an adult product on a young child without asking the pharmacist.

There is an important reason some products fail here: resistance. A 2023 study in PeerJ analysed lice collected from primary school pupils in Jeddah and found the permethrin resistance mutation in 28 of 45 samples, or 62.2 percent. This does not mean permethrin never works, but it does mean that if you have used it correctly twice and still find live lice, the lice are probably resistant and you need a different type of product, not a bigger amount of the same one.

Products that work physically, such as dimeticone, are not expected to lose their effect to resistance in the same way, which is why many doctors and pharmacists turn to them when resistance is suspected. Ask the pharmacist about the minimum age for each product, and tell them if your child has asthma or a skin condition, or if the person being treated is pregnant or breastfeeding.

Why kerosene, petrol and animal insecticides are dangerous

In many villages and neighbourhoods in our region an old remedy is still passed down: pour kerosene or petrol over the child's head and wrap it in a plastic bag overnight. Sometimes parents use a pesticide from the agricultural supply shop, a spray meant for sheep or poultry, or a household insect powder. These substances may kill lice, but they can do far more harm to the child than to the louse.

Kerosene and petrol cause chemical burns to the scalp, release fumes that the child breathes for hours under the bag, and catch fire easily, so a single spark from a heater, a gas stove or a lighter can set a child's hair alight. If kerosene reaches the child's mouth or is breathed in, it can cause chemical pneumonia. A 2019 review in the Indian Journal of Critical Care Medicine described aspiration pneumonitis as the most common complication of kerosene poisoning in children, and stressed that you must not try to make a child vomit after swallowing it.

Farm and veterinary insecticides are concentrated and designed for larger animals or for spraying fields, not for a child's skin. Some belong to families of chemicals that act on the nervous system and can be absorbed through the skin. Even insecticides that were once used as medicines have shown this risk: a 2012 review in Pediatric Dermatology gathered 67 cases of serious reactions and deaths linked to lindane, formerly used against lice and scabies, and many of the most serious occurred in children.

Vinegar, olive oil and mayonnaise are not dangerous in the same way, but there is no strong evidence that they clear lice on their own. If you like using olive oil, treat it as a substitute for conditioner during wet combing, not as a treatment in its own right.

Should I check the whole family, and what needs washing?

Yes, check everyone in the household with wet combing on the same day, including both parents and a grandparent who lives with you. But treat only the people in whom you find live lice, because treating someone without lice does not protect them and exposes them to products they do not need. Ideally treat everyone affected on the same day, so nobody passes lice back to someone who has just been cleared.

If your child spends weekends with relatives or sleeps alongside cousins at the grandparents' house, let those families know gently so they can check their children. In large, close-knit families this is the most common route by which lice return. Tell the school too, without naming your child if you prefer, so that it can alert other parents.

The good news is that you do not need to deep clean the house. A louse that falls off the head weakens quickly and usually dies within a day or two because it cannot feed. The NHS says there is no need to wash laundry on a hot wash. It is enough to wash or soak your child's combs and brushes, and to put the pillowcase and any headscarf worn in the last two days through an ordinary wash.

Do not spray insecticide on mattresses, carpets or sofas. It does nothing for head lice and exposes children to toxic chemicals. And do not shave a girl's head unless she wants it, because shaving is not necessary and at school age it can leave a deeper mark than the lice themselves.

Head lice myths and facts

Many ideas about lice add to the shame or push families towards the wrong treatment. Some lead parents to isolate a child or shave their head, others lead them to apply insecticide every day. The table below sums up the most common, along with what the evidence says.

Remember that your child does not need to stay home because of lice. The NHS is clear that children do not need to miss school, since the lice were probably there for weeks before anyone noticed. Start treatment in the evening and let your child go to school in the morning as usual.

Likewise there is no need to stop your child playing with friends. Instead, teach them not to share combs, caps and hair ties, and encourage girls with long hair to wear it tied back in a braid or bun at school. These small habits reduce spread without turning lice into a stigma.

Why do lice keep coming back, and when should I see a doctor?

If you still find live lice after treatment, there are four common explanations. The first is that the second round was skipped or done too early. The second is that not enough product was used to cover all the hair, which is common with long, thick hair. The third is a new infestation from someone who was not checked. The fourth is that the lice are resistant to the product used, a real possibility in our region, as the Jeddah study showed.

Before you use the same product a third time, stop and speak to a pharmacist or doctor. Applying insecticide again and again over a few days does not make it work better. It irritates the scalp and can cause itching that carries on after the lice are dead, so parents assume the infestation is still active. Itching can last a week or more after successful treatment.

See a doctor if your child is under two, if a pregnant or breastfeeding mother needs treatment, or if your child has asthma or a skin condition on the scalp. See one too if the scalp becomes red, swollen or weeps pus, if the glands at the back of the neck swell, or if your child develops a fever, because scratching may have caused a bacterial infection that needs treatment.

If you see lice or eggs on the eyelashes or eyebrows, do not put any lice product or chemical near them, because the eye is very sensitive. Have your child seen by a doctor, who can decide on a safe method.

Sources

• AlBashtawy M, Hasna F: Pediculosis capitis among primary-school children in Mafraq Governorate, Jordan, Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit, 2012
• Khamaiseh AM: Head Lice among Governmental Primary School Students in Southern Jordan: Prevalence and Risk Factors, Journal of global infectious diseases, 2018
• Alsaady IM, Altwaim S, Gattan HS et al: Prevalence of permethrin-resistant kdr mutation in head lice (Pediculus humanus capitis) from elementary school students in Jeddah, Saudi Arabia, PeerJ, 2023
• Leung AKC, Lam JM, Leong KF et al: Paediatrics: how to manage pediculosis capitis, Drugs in context, 2022
• Nolan K, Kamrath J, Levitt J et al: Lindane toxicity: a comprehensive review of the medical literature, Pediatric dermatology, 2012
• Kumar S, Kavitha TK, Angurana SK et al: Kerosene, Camphor, and Naphthalene Poisoning in Children, Indian journal of critical care medicine : peer-reviewed, official publication of Indian Society of Critical Care Medicine, 2019
• NHS: Head lice and nits