Lice eggs, called nits, are tiny oval specks that cling to individual hair strands close to the scalp. They’re smaller than a sesame seed and can be white, yellowish-brown, or beige, making them easy to confuse with dandruff or dry skin flakes. The key difference: nits are glued to the hair shaft and won’t brush off easily, while dandruff slides away with a light flick. Knowing exactly what to look for, where to look, and how to check will save you time and unnecessary worry.
What Nits Look Like Up Close
A lice egg is a small, slightly elongated speck roughly the size of a pinhead. To put that in perspective, the CDC compares its size against a penny, where a nit is barely a fraction of Lincoln’s ear. They sit on one side of a hair strand, attached at an angle rather than wrapping all the way around it.
Color is your most useful clue, and it changes depending on whether the egg is alive, dead, or already hatched:
- Live eggs: White, yellow, beige, or pale brown. Darker brown tones mean the egg is closer to hatching.
- Dead eggs: Typically brown or black. They may look slightly deflated or shriveled compared to plump, viable ones.
- Hatched casings: White, gray, or translucent. These are empty shells left behind after a louse has emerged.
If you squeeze a live nit between your fingernails, it often makes a small pop. Dead or empty casings usually don’t, or they crumble without resistance. This simple test can help you figure out whether you’re dealing with an active problem or leftover debris from a previous infestation.
Where Nits Are Found on the Head
Female lice lay their eggs within about a quarter inch of the scalp because the warmth is essential for incubation. The favorite spots are behind the ears, along the neckline, and near the crown, where skin temperature stays consistently high. If you’re checking someone’s head, start in these areas before working through the rest of the hair.
Distance from the scalp tells you a lot. Nits found within a quarter inch of the scalp are the ones most likely to be viable and worth treating. Nits further out on the hair shaft have usually already hatched or died, because hair grows and carries the empty casing away from the warmth it needs. The CDC notes that nits more than a quarter inch from the scalp are unlikely to hatch and may just be empty shells. So while finding nits far down the strand can look alarming, it often means the active phase has passed or that treatment is already working.
How Nits Differ From Dandruff
This is the question most people are really trying to answer. From a distance, nits and dandruff flakes look nearly identical: small, pale specks scattered through the hair. Up close, the differences are clear.
Dandruff flakes sit loosely on the hair or scalp. Run your fingers through the hair and they fall off easily, sometimes landing on your shoulders. Nits are cemented to the hair strand with a glue-like substance the female louse produces. You can’t simply brush them away. To remove a nit, you need to pinch it between your fingernails or drag it along the full length of the strand with a fine-toothed comb. That resistance when you try to move it is the single most reliable way to tell a nit from a flake of dry skin.
Shape helps too. Dandruff flakes are irregular, flat, and papery. Nits have a consistent, slightly oval form and tend to sit at the same angle on the strand. If you look at several suspicious specks and they all share the same shape and attachment style, you’re likely looking at nits.
The Wet Combing Method
Wet combing is the most effective way to find nits and live lice at home. You need a fine-toothed lice detection comb with teeth spaced less than 0.3 millimeters apart, which is narrow enough to trap both eggs and young lice. These combs are sold at most pharmacies. Some experts recommend plastic over metal because plastic teeth glide more gently against the scalp.
Here’s how to do it:
- Wash the hair with ordinary shampoo.
- Apply a generous amount of conditioner. This makes the hair slippery, which slows down live lice and makes combing smoother.
- Detangle first with a regular wide-toothed comb so the detection comb can pass through without snagging.
- Switch to the lice comb. Slot the teeth into the hair right at the roots, with the comb lightly touching the scalp, and draw it all the way to the tips in one steady stroke.
- Check the comb after every stroke. Wipe it on a white paper towel or rinse it in a bowl of water so you can see what you’ve caught.
- Work through the entire head section by section. Clip finished sections out of the way to avoid rechecking the same area.
- Rinse out the conditioner, then repeat the full combing process on the wet hair to catch anything you missed the first pass.
Good lighting matters. Natural daylight or a bright lamp aimed at the scalp will make nits much easier to spot. A magnifying glass can also help, especially if you’re checking fine or light-colored hair where nits blend in.
How Quickly Nits Hatch
A viable nit hatches in about 6 to 9 days, with a week being typical. Once hatched, the young louse (called a nymph) begins feeding on the scalp almost immediately. This is why catching nits early matters: every egg you remove before it hatches is one fewer louse that can reproduce and lay more eggs.
Temperature is critical for survival. Nits need the warmth found close to the scalp to develop. If an egg falls off the head or ends up on a pillowcase, it usually dies within a week without that consistent heat. This is also why nits laid right at the scalp line are the active concern, while ones further down the strand have often already failed to develop.
What Counts as an Active Infestation
Finding nits alone doesn’t always mean you have an active infestation. The strongest evidence is spotting a live, crawling louse. Nits within a quarter inch of the scalp are the next most reliable sign, since their location means they were laid recently and could still hatch. The CDC recommends treating anyone who has live lice or nits within that quarter-inch zone.
If you only find nits far from the scalp and no live lice after thorough wet combing, you may be looking at remnants of a past infestation. Empty casings can cling to hair for weeks or even months after the lice are gone, which is why some people keep finding “nits” long after successful treatment. These leftover shells are cosmetically annoying but not a sign of ongoing activity. Regular wet combing every few days for two to three weeks is the most reliable way to confirm whether live lice are still present or the infestation has been resolved.