If your child's scalp has started to itch, the school has sent home a warning letter, or you have spotted tiny tan-coloured insects on a comb, the answer is almost always the same: head lice. They are extremely common in UK primary schools, completely harmless, and straightforward to get rid of — though it takes patience.

This guide sets out how to confirm head lice, which treatment options your pharmacist will recommend, and the rules of thumb that stop them coming back a fortnight later.

What head lice are

Head lice are small insects that live on the human scalp and feed on tiny amounts of blood. They are not dangerous, they do not spread disease in the UK, and they are not a sign of poor hygiene. According to the NHS, a clean head is just as attractive to head lice as a dirty one.

Eggs are glued to hair shafts close to the scalp. The empty egg cases — "nits" — remain attached after the louse has hatched and are often what parents spot first. Adult lice are about 2 to 3 mm long, grey-brown, and move surprisingly fast through dry hair.

Head lice spread by head-to-head contact, not by sharing hats, hairbrushes or pillowcases (though prolonged shared contact with a brush can transfer them). They do not jump, fly, or survive long away from the scalp.

How to confirm they are there

The NICE Clinical Knowledge Summary is clear: a diagnosis of active head lice requires a live, moving louse to be seen. Itching and empty nit cases alone are not proof. False alarms are common in the school year — dandruff, hair product residue and pollen can all be mistaken for nits from a distance.

The reliable test is detection combing:

1. Wash the hair as normal and apply plenty of conditioner so the hair is slick.
2. Comb through with a standard comb to remove knots.
3. Switch to a fine-toothed detection comb — tooth spacing 0.2 mm or less.
4. Working in small sections from the scalp outwards, comb from root to tip over a sheet of white paper or a white-tiled bathroom floor.
5. Wipe the comb between strokes and look for live lice.

If you see at least one live louse, treat. If you see only empty nit cases more than a couple of centimetres from the scalp, you probably had head lice but do not currently.

The two treatment routes

There are two mainstream routes for clearing head lice in the UK, and your pharmacist will discuss both.

Physical treatments (dimeticone and mineral oil lotions)

Most pharmacists now recommend dimeticone-based lotions as a first-line option. The familiar brands are Hedrin, Full Marks and Lyclear. They work by coating the lice and suffocating them, rather than killing them chemically.

Typical regimen:

• apply the lotion to dry hair, working it thoroughly from scalp to tips
• leave for the time stated on the pack (often 8 hours or overnight for standard strength, or 15 minutes for the newer higher-concentration products)
• wash out and comb through with a detection comb
• repeat after 7 days to catch any lice that hatched from eggs that survived the first application

Physical treatments are safe for pregnant women, breastfeeding mothers, and children from 6 months upwards.

Wet combing (the Bug Buster method)

Wet combing with a fine-toothed comb, known widely as the Bug Buster method, is entirely chemical-free. It relies on mechanical removal.

The method is:

• wash the hair and apply lots of conditioner
• comb systematically with a detection comb from root to tip
• repeat every 3–4 days for at least two weeks, to catch newly hatched lice before they mature

Wet combing works, but it requires time and discipline — around 20–30 minutes per session, for two weeks, in a squirming child. For many families a dimeticone lotion is less work.

What the pharmacist adds

A community pharmacist can help you:

• confirm whether what you have spotted is actually live head lice
• choose between the dimeticone lotion brands based on contact time, age of the child, and cost
• explain what to do if the first round of treatment does not clear the infestation
• advise on treating other household members only if they have confirmed live lice

Crucially, pharmacists will not recommend insecticide-based lotions as a first line. Older products such as malathion are still available but resistance has been documented, and guidance has shifted away from them.

Most pharmacy consultations for head lice are informal, free, and walk-in. See the PharmSee directory for pharmacies in your area.

What not to do

NHS guidance explicitly recommends against:

• boiling bedding, deep-cleaning the house, or treating pets. Head lice do not survive long off a human scalp; household decontamination is not needed.
• using regular shampoo that claims to "repel" lice unless it has a real dimeticone or other active ingredient.
• treating the whole family on precaution. Only treat confirmed cases.
• avoiding school. Children with head lice do not need to stay at home.

When to see a GP or pharmacist urgently

Head lice do not cause serious illness. But book a pharmacy or GP appointment if:

• scratching has broken the skin and the scalp looks infected (pus, spreading redness)
• two rounds of appropriate treatment spaced 7 days apart have not cleared the lice
• the person affected has a skin condition on the scalp that complicates treatment

For uncomplicated cases the minor illness referral pathway is fast and simple — a pharmacy visit will almost always resolve it.

The school-age reality

Head lice will travel through a primary school year after year. The only reliable way to break the cycle is rapid identification and treatment of each case as it appears. Screening healthy children every week is not recommended by the NHS, and it is exhausting for parents. Respond to symptoms or confirmed school notifications, but otherwise leave it alone.

Sources

• NHS — Head lice and nits (nhs.uk)
• NICE Clinical Knowledge Summary — Head lice
• British National Formulary for Children — Head lice treatments

PharmSee publishes UK pharmacy consumer health guides grounded in NHS clinical guidance.