White Dots in Hair: Nits, Dandruff or Product Build-up?

Nits are the eggs that head lice lay on hair shafts. They are the one cause of white specks you need to rule out, but the CDC notes nits are often confused with dandruff, hair spray droplets and dirt.

Key features of a nit:

Size and shape: oval, about 0.8 mm long, roughly the size of a knot in thread. Colour: the CDC describes eggs as usually yellow to white, and the NHS describes nits as brown or white. After hatching, the empty shell stays attached to the hair. Attachment: nits are cemented to one side of the hair shaft, close to the scalp. They do not brush or blow away. Location: the CDC notes nits are often found behind the ears and near the back of the neck.

If a speck grips the hair and takes real effort to slide off, it is more likely to be a nit than a flake. The NHS says the only way to be sure someone has head lice is by finding live lice, so confirm with a comb check.

Dandruff and nits can look similar at a quick glance, but the differences are clear up close.

Shape: nits are oval or teardrop-shaped; dandruff is flat, irregular flakes. Attachment: nits are glued to the hair; dandruff falls off easily when touched or brushed. Texture: a nit feels like a tiny knot on the strand; dandruff is a dry or greasy flake. Location: nits sit close to the scalp, especially behind the ears and at the nape; dandruff is often spread across the scalp.

The slide test: pinch the hair strand just below the speck and try to slide it down with your fingernail. If it moves easily or crumbles, it is more likely to be dandruff or product. If it stays stuck and needs force to remove, it may be a nit.

Dandruff shampoo can help a flaky scalp, but it is not a head lice treatment. If you find live lice, use wet combing or a medicated head lice lotion or spray.

Not every white dot in hair is a nit or dandruff.

Hair Casts (pseudonits) Hair casts are white, tube-like sheaths that wrap around the hair shaft. They can look like nits at a glance, but they slide freely up and down the strand, while a nit stays fixed to one side of the hair. Hair casts are not lice.

Product Build-up Hair spray, gel, mousse or dry shampoo can leave small white specks. Build-up usually smears or crumbles when you rub it between your fingers and brushes or washes out easily.

Not all nits are white. The NHS describes nits as brown or white.

Distance from the scalp matters: the CDC says eggs that are still viable are usually within about 6 mm (a quarter of an inch) of the scalp. Nits further down the hair: the CDC says nits more than about 6 mm from the scalp are almost always hatched or dead.

If you find no live lice and the only nits are more than about 6 mm from the scalp, the CDC says the infestation is probably old and does not need treatment. Keep checking with a detection comb over the following weeks to catch anything you missed.

How to Check at Home

Use a fine-toothed detection comb, not just your eyes. You can buy one online or from pharmacies. Wash the hair with ordinary shampoo and apply lots of conditioner. The NHS says any conditioner will do. Comb the whole head from the roots to the ends, wiping the comb on a white tissue after each stroke. Look for live lice, not just nits. Empty shells can stay in the hair after lice have gone.

When to Treat The NHS says to treat head lice as soon as you spot live lice, and that you can do this without seeing a GP. Check everyone you live with or have close contact with, and start treating anyone who has head lice on the same day.

Treatment options (NHS guidance):

Wet combing: comb wet, conditioned hair with a detection comb on days 1, 5, 9 and 13, then check again on day 17. Medicated lotions and sprays: if wet combing has not worked or is not suitable, use a lotion or spray from a pharmacy, supermarket or online. Check the pack to see whether it suits your child and how to use it. Some treatments need to be repeated after a week. Not recommended: the NHS says products containing permethrin, head lice "repellents", electric combs and plant oil treatments such as tea tree oil are unlikely to work.

School The NHS says there is no need to keep your child off school if they have head lice. The CDC also advises that students can return to class after starting appropriate treatment, even if some nits remain. Some schools have their own policies, so check with your school if you are unsure.

Most head lice can be managed at home with careful combing or over-the-counter treatments. Extra help may be useful if:

Lotions or sprays have been used correctly but live lice keep turning up (the NHS suggests speaking to a pharmacist). You are unsure whether you are seeing nits, dandruff or something else. Your child has a sore scalp, or scratching has caused sores that look infected (speak to a pharmacist or GP). You want hands-on help with checking or combing.

Professional lice clinics can help with identification checks and combing. You can also Get In Touch if you need help finding a local clinic.

White specks in hair can cause a moment of panic, but the slide test, a detection comb and a calm, careful check will usually tell you whether you are looking at nits, dandruff or product build-up. If you are still unsure, a pharmacist or professional lice clinic can help confirm, and you can Get In Touch for help finding one.

Use this answer as one piece of evidence, not the whole decision. If you want a quick second check, start with the AI head lice checker, then compare your result with the wider AI Detection hub so you can see where this question fits in the bigger picture.

If what you are seeing still overlaps with common lookalikes, compare it with what do head lice look like in hair and what do nits look like on hair shafts before moving to treatment on guesswork alone.

When the evidence remains mixed after a better photo or repeat check, move from uncertainty to confirmation. The most practical escalation routes are How to Choose a Head Lice Clinic Near You and the Head Lice Clinic Locations hub.

If active lice becomes likely, use the shop treatment reviews and the review of the NitNOT Fine Tooth Comb as decision support rather than treating every doubtful sign automatically.