Tiny Bugs in Hair: Lice or Something Else?

Head lice are small, wingless insects that live on the human scalp and feed on blood. They are about the size of a sesame seed and move quickly, which makes them hard to spot. What you are more likely to see are their eggs, known as nits.

Nits are oval, about 0.8 mm long, and usually yellow to white. They are glued firmly to individual hairs close to the scalp, often within a few millimetres of the skin. Because they stick tightly, they cannot be flicked off easily — unlike dandruff, hair spray residue, or dirt particles.

To check properly, use a fine-toothed detection comb. The most reliable method is wet combing:

Wash the hair with ordinary shampoo and apply plenty of conditioner. Comb through with a wide-toothed comb first to remove tangles. Switch to a fine-toothed metal or plastic detection comb. Work through the hair in small sections, from the scalp to the ends. After each stroke, wipe the comb onto a white tissue or paper towel. Look for live lice (they will move) or nits (firmly attached eggs).

The best way to confirm an active infestation is to find a live louse. Finding only nits that are more than a quarter of an inch (about 6 mm) from the scalp usually means the infestation is old and no longer active.

What can be mistaken for lice or nits?

Dandruff – Flakes are white, loose, and fall off easily. They are not attached to hair shafts. Lice eggs are glued on and need to be pulled off. Hair product residue – Sprays, gels, or mousse can leave sticky specks, but these can be washed out or brushed away. Dirt or sand – Easily removed with a comb and do not stick to individual hairs. Fleas – Fleas are darker (brown or black), move very quickly, and can hop. They rarely live on human hair and are usually brought in by pets. Other small insects – Booklice, carpet beetles, or aphids can sometimes end up on hair but do not feed on the scalp. They do not cause itching and do not lay nits.

If you are unsure, a magnifying lens and bright light can help. Asking someone else to check the back of the head and behind the ears is often easier.

The most frequent symptom is itching — an allergic reaction to louse saliva. Itching may take a few weeks to develop after the first infestation. Other signs include:

A crawling sensation on the scalp. Small red bumps or sores, especially at the nape of the neck and behind the ears, caused by scratching. Visible nits glued close to the scalp, often behind the ears and at the hairline on the neck.

It is possible to have head lice without any itching, especially if it is a very light infestation. That is why regular checking with a detection comb is recommended, particularly if there is a known outbreak at school or in the family.

In the UK, the NHS recommends wet combing with conditioner and a fine-toothed comb as the first-line treatment. This method is effective, carries no risk of skin irritation, and does not contribute to insecticide resistance.

Wet combing routine

Do this on day 1, then again on day 5, day 8, and day 13 to catch newly hatched lice. Wash hair as normal, apply plenty of conditioner, and comb through section by section for at least 15–20 minutes. Rinse and repeat every three to four days for two weeks. Continue checking weekly for another month to make sure no lice return.

Medicated treatments If wet combing is not working or you prefer a chemical option, you can use a licensed insecticide lotion or spray from a pharmacy. In the UK, products containing dimeticone (a silicone oil that suffocates lice) are widely used and are generally safe for children over six months. Other active ingredients include malathion and isopropyl myristate.

Important points:

Always read the product label and follow instructions exactly. Do not use more than one product at a time. Check whether the product is suitable for your child’s age and for any existing skin conditions. If you use a medicated treatment, continue to comb out nits afterwards to ensure removal.

There is no need for children to stay off school if they have head lice. However, you may wish to inform the school or nursery so they can alert other parents.

What about natural or home remedies? Tea tree oil, mayonnaise, olive oil, and similar substances are not supported by UK clinical guidance for treating head lice. They may not kill lice or eggs effectively and can cause skin irritation. The NHS advises sticking to the wet combing method or licensed products.

Head lice are spread mainly by direct head-to-head contact. They do not jump or fly. The risk from sharing items like hats, brushes, or bedding is much lower, but it is still sensible to take some precautions:

Avoid sharing hairbrushes, combs, helmets, hats, and headphones. Tie back long hair for school or play activities. Check all family members every week with a detection comb, especially if someone has been treated. Wash bedding and towels on a normal hot cycle — there is no need for special lice sprays on furniture or soft toys.

Remember: head lice are not a sign of poor hygiene. They do not discriminate between clean and dirty hair. Any child or adult can get them.

Most head lice cases can be managed at home without medical advice. However, you should see a GP or speak to a pharmacist if:

Wet combing or over-the-counter treatments have not worked after several attempts. The scalp becomes sore, swollen, or shows signs of infection (yellow crusting, pus). You are treating a child under six months old. You are pregnant or breastfeeding and unsure which product is safe. You are not confident you have correctly identified head lice.

At the appointment, the doctor can confirm the diagnosis and may prescribe a stronger treatment if needed. In the UK, head lice treatments are not available on NHS prescription in all areas, so check with your local pharmacy or GP.

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.