The only way to confirm you have head lice is to find a live louse or nymph on your scalp or hair. Itching is the most recognized symptom, but it’s not reliable on its own, and misdiagnosis is surprisingly common. Many people mistake dandruff, dry skin flakes, or old egg casings for an active infestation. Here’s how to check properly and know for sure what you’re dealing with.
Symptoms That Suggest Lice
Itching is the most common symptom, caused by an allergic reaction to louse saliva. It tends to be worst behind the ears, along the hairline at the back of the neck, and around the temples. The catch is that itching can take weeks to develop after the initial exposure, especially if it’s your first time having lice. Some people never itch at all. So the absence of itching doesn’t rule lice out, and itching alone doesn’t confirm them.
Repeated scratching can lead to small red bumps or sores on the scalp, neck, and shoulders. On darker skin tones, these bumps may be harder to spot visually but can still be felt. You might also notice a tickling sensation, as if something is moving through your hair, particularly at night when lice are most active.
What Lice and Nits Look Like
Adult lice are dark in color and roughly the size of a poppy seed. They move quickly and avoid light, which makes them difficult to spot just by looking. Nymphs (baby lice) are even smaller and nearly transparent.
Nits, the eggs lice lay, are easier to find. They’re tiny oval specks, white or yellowish-brown, glued firmly to individual hair shafts close to the scalp. You’ll most often see them behind the ears and near the nape of the neck, where the warmth of the scalp helps them incubate. Eggs hatch in about seven days, and the new louse reaches reproductive maturity in another seven days, so an untreated case can grow quickly.
Nits vs. Dandruff
This is where most confusion happens. Dandruff flakes are white-to-yellowish pieces of dry skin that sit loosely on the hair and scalp. The simplest test: try to flick the speck off the hair shaft with your finger. Dandruff slides off easily. Nits don’t. Lice eggs secrete a glue-like substance that bonds them to the hair, so they grip tightly and resist removal. You typically need to pinch them between your fingernails or slide them along the full length of the strand to get them off.
Hair spray residue, hair casts, and other debris can also look like nits at first glance, but all of these come off the hair easily. If the speck is firmly attached and oval-shaped, it’s likely a nit.
How to Do a Proper Check
A visual scan of dry hair misses most cases. The most reliable method at home is wet combing, which traps lice that would otherwise crawl away from your fingers. Here’s how to do it:
- Wash your hair with regular shampoo.
- Apply a generous amount of conditioner. This slows the lice down and makes the comb glide more smoothly.
- Use a wide-toothed comb first to detangle knots.
- Switch to a fine-toothed lice comb with teeth spaced less than 0.3 mm apart (these are sold at most pharmacies).
- Comb through small sections of hair from root to tip, wiping the comb on a white paper towel or tissue after each pass.
- Work systematically around the entire head, paying extra attention to behind the ears and the base of the neck.
- Repeat the full combing a second time to catch anything you missed.
On the paper towel, live lice will appear as tiny dark specks that move. Nits pulled from the hair will look like small dots that don’t move. Good lighting makes a big difference. Natural daylight or a bright lamp aimed at the towel helps you see what you’ve collected.
Active Infestation vs. Old Nits
Finding nits doesn’t automatically mean you have an active infestation that needs treatment. Location on the hair shaft is the key detail. Nits found within a quarter inch of the scalp are likely live and viable. Nits attached more than a quarter inch from the scalp are almost always already hatched or dead, since hair grows away from the scalp over time and carries the empty casings with it.
If you find no crawling lice and the only nits you see are far from the scalp, you’re probably looking at the remnants of an old infestation that has already resolved. Treatment is only necessary when you have an active case, confirmed by finding a live nymph or adult louse, or by finding nits cemented close to the scalp.
Checking Someone Else vs. Checking Yourself
It’s much easier to check another person’s head than your own. If you suspect you have lice, ask someone to do the wet combing for you under good lighting. They can part small sections of hair and examine the scalp directly, which is nearly impossible to do on yourself with the same thoroughness.
If no one is available to help, you can still do a partial self-check. Wet comb your own hair over a white towel or inside a white sink, then examine whatever the comb collects. Focus your combing on the areas behind your ears and at the nape of your neck, since these are the spots lice favor most. A handheld mirror angled against a wall mirror can help you visually inspect those zones, but the wet comb method is far more reliable than trying to spot lice by sight alone.
What to Do if You Find Live Lice
If wet combing confirms live lice, over-the-counter treatments designed to kill lice are the standard first step. These are applied to the hair and scalp, left on for the specified time, then rinsed out. Because most treatments don’t kill all nits, a second application is typically needed about seven to nine days later to catch any newly hatched nymphs before they mature.
Between treatments, repeat the wet combing process every three days. The goal is to reach four consecutive combing sessions where no live lice are found. At that point, the infestation is considered cleared. Lice can’t survive more than a day or two off a human head, so you don’t need to fumigate your house. Washing pillowcases, hats, and hair accessories in hot water and drying on high heat is sufficient for items that had recent contact with the infested person’s head.