Head Lice and School: What Are the Rules?
My School Agent | 8 July 2026
I found the first nit on a Sunday night while combing through my son's hair. My immediate thought: can he go to school tomorrow? Will they send him home? Do I need to bag up all the soft toys?
Deep breath. Here's what you need to know.
Schools Cannot Exclude for Head Lice
This is NHS guidance, and schools in England must follow it. Head lice are not classified as an infectious disease. Your child cannot be excluded for having them.
If a school tries to send your child home or bar them from attending, they're wrong. Politely but firmly point them to the NHS guidance.
That said, if your child's head is visibly crawling with live lice and you've done nothing about it, expect a conversation. Schools can't exclude, but they can (and should) talk to you about treatment.
Why the No-Exclusion Rule Exists
Head lice are unpleasant but harmless. They don't spread disease. They're not a sign of poor hygiene. Anyone can get them.
Excluding children for head lice would mean constant disruption. In some classes, half the children would be off every few weeks.
And exclusion doesn't work. Head lice spread through head-to-head contact. If four children in a class have them, sending one child home doesn't stop the cycle.
The Reinfection Cycle (And Why It's So Frustrating)
You treat your child on Sunday. They go to school on Monday. By Wednesday, they've picked them up again from a classmate whose parents haven't checked yet.
This is why head lice feel never-ending. You're doing everything right, but you can't control what other families are doing.
Head lice can't jump or fly. They crawl. They transfer during close contact: reading together, playing, hugging, heads bent over a puzzle.
Primary-age children, especially, are constantly in physical contact. Head lice paradise.
What Schools Can (and Can't) Do
Schools can send a general letter to all parents in the class saying head lice have been reported and everyone should check and treat if necessary.
Schools cannot name which child has head lice. That's a breach of privacy.
Schools can educate children about head lice (that they're common, nothing to be ashamed of, easy to treat).
Schools can encourage parents to check regularly, especially after a reported case.
What schools can't do: force you to treat your child, inspect every child's head at the gate, or exclude.
Detection Combing (The Only Reliable Check)
Forget looking with your eyes. You won't see them unless there's a heavy infestation. Head lice are tiny, fast, and hide.
Detection combing is the only reliable way to check. You need:
- A fine-toothed detection comb (buy from any pharmacy, about £5)
- Conditioner (makes it easier to comb through and slows the lice down)
- Good lighting
- 10-15 minutes of patience
Wet the hair. Apply loads of conditioner. Comb from root to tip, wiping the comb on kitchen roll after every stroke. If you see a louse or nits (eggs), treat immediately.
Treatment Options
Wet Combing (Bug Busting)
The NHS-recommended method. No chemicals. You comb conditioner through wet hair every few days for two weeks to physically remove lice and newly hatched nymphs.
It works if you're rigorous. But it's time-consuming and easy to miss a day and let the cycle restart.
Chemical Treatments (Dimeticone or Insecticide Lotions)
Available over the counter. You apply the lotion, leave it for the specified time (usually 8-12 hours or overnight), then wash out and comb through.
Repeat after 7 days to catch any lice that hatched from eggs the first treatment didn't kill.
Some head lice populations are resistant to older insecticide treatments. Dimeticone (which works by physically coating the lice) is less prone to resistance.
What Doesn't Work
Tea tree oil: Not proven to work. Might smell nice.
Mayonnaise, olive oil, vinegar: Not proven. Messy. Don't bother.
Electric combs: Mixed evidence. Expensive.
Cutting your child's hair short: Might make combing easier but won't prevent head lice. They can live on hair as short as 5mm.
The Weekly Check Routine
The only way to stay ahead of head lice is to check regularly. Every week, ideally. Especially if your child's school has sent a letter recently.
Make it routine. Sunday bath time. Wednesday evening. Whenever works. Detection comb, conditioner, 10 minutes.
If you catch them early (one or two lice, no heavy infestation), treatment is quick and you stop the spread to siblings and classmates.
What About the Rest of the House?
Head lice can't live off a human head for more than 24 hours. They need blood meals.
You don't need to wash all the bedding, bag up toys, or hoover the sofa obsessively.
Wash pillowcases and hairbrushes if it makes you feel better, but it's not necessary. Focus your energy on treating heads, not houses.
Breaking the Cycle Requires Community Action
This is the hard part. You can do everything right and still face reinfection if other families aren't checking and treating.
Schools can't force parents to act. There's no head lice police.
What helps: normalising the conversation. Talking openly at the gate about head lice. Texting other parents when you find them. "Just found nits on Ella, thought you'd want to check yours too."
The shame around head lice keeps the cycle going. If everyone checked and treated without embarrassment, the problem would shrink.
When to See a Doctor
Head lice themselves don't need medical attention. But if your child has scratched their scalp raw and it looks infected (red, swollen, weeping), book a GP appointment. They might need antibiotics.
If over-the-counter treatments aren't working after two cycles, ask your pharmacist or GP. They might recommend a prescription-strength product.
My School Agent doesn't prevent head lice, but it does make sure you don't miss the school letter warning you to check. That early heads-up means you catch them before they spread to everyone in the house.