Head lice are tiny, flattened insects about 1/8 inch long, with six clawed legs, segmented bodies, and tan, gray, or white coloring. Nits are oval eggs cemented to hair shafts, while crawling movement and firm attachment help separate them from dandruff, sand, lint, and hair-product residue.
This guide explains how to inspect hair, identify head, body, and pubic lice, distinguish viable nits from empty shells, and decide when uncertainty warrants help from a healthcare professional, pharmacist, or school nurse.
Head Lice Have Distinctive Body Features
Look for a small, flattened insect with a segmented body, six clawed legs, and a tapered rear. Head lice, scientifically named Pediculus humanus capitis, can resemble a tiny grain of rice or a pinhead-sized fleck.
An adult measures about 1/8 inch long. Younger lice, called nymphs, are smaller and may be harder to see without magnification. Their color can shift with lighting, skin tone, and life stage, so shade alone offers little help.
| Feature | What you may see |
|---|---|
| Body | Flattened, segmented, and shaped somewhat like a tiny grain of rice |
| Color | Tan, gray, or white under different lighting conditions |
| Legs | Six legs ending in claws that grip individual hair shafts |
| Movement | Quick sideways crawling, especially when the hair is disturbed |
Movement is a stronger clue than color. A live louse may flatten against the scalp or dart along a strand when you part the hair. A speck that looks stationary in dark hair may move when you view it against a white background in brighter light.
Attachment Separates Eggs From Loose Debris
A live louse moves, has visible body segments, and grips hair with its feet. A nit remains fixed to one strand, while dandruff, sand, lint, and product residue sit loosely or spread when brushed or shaken. That attachment difference is usually more useful than color.
Nits may appear white or yellow when newly laid and brown as they age. Color alone cannot establish whether an egg is viable. Finding a moving nymph or adult provides the clearest evidence of an active infestation.
| Finding | Shape and color | Attachment or movement |
|---|---|---|
| Live louse | Segmented, flattened, tan, gray, or white | Crawls; legs grip hair |
| Viable nit | Oval; white, yellow, or brown | Firmly attached to a hair shaft; viability cannot be confirmed by sight alone |
| Empty or hatched nit | Oval or shell-like; often pale, translucent, or brown | Remains attached after the insect emerges |
| Dandruff | Irregular white or pale flakes | Loose; brushable or washable |
| Sand or lint | Angular or fibrous specks | Loose; usually falls away easily |
| Hair-product residue | White, powdery, or flaky | Spreads, shifts, or flakes with handling |
A viable nit can remain firmly fixed to a hair, so sliding it down with your fingers is not a reliable viability test. A close view and repeated scalp checks are more informative. Dry hair may reveal movement clearly, while damp hair separates strands and makes attached eggs easier to inspect.
Once you know what you are seeing, concentrate the search where nits and lice are most likely to hide.
Wet hair and a fine-toothed detection comb separate small insects and attached eggs from loose material more clearly than a dry glance through tangled hair.
Scalp Hair and Specific Areas Need Close Inspection
Lice stay near the scalp because it provides regular access to skin. They do not jump or fly, and direct head-to-head contact can carry them from one person to another. Clothing may carry body lice, but head lice remain mainly on scalp hair.
A quick look over the top of the head can miss the areas where nits and insects are easiest to overlook. Concentrate near the roots, where the hair, scalp, and insects stand out more clearly against a contrasting background.
- Inspect the crown: Separate narrow sections and look close to the roots.
- Check behind the ears: Part the hair where it lies against the neck.
- Trace the hairline: Concentrate on the forehead, temples, and back edge.
- Review the neckline: Look for crawling insects, attached nits, or small red, itchy bumps.
- Examine clothing: Inspect collars, hats, scarves, and towels that touched the head.
- Consider close contacts: Repeated sightings or scalp itching in another person can justify another inspection.
Scalp itching may begin after a new infestation rather than immediately after an insect arrives. The delay can allow head-to-head contact to continue unnoticed. Check the crown, neckline, and area behind the ears even if itching is mild or absent.
A Two-Pass Routine Improves Detection
Prepare the Hair and Lighting
Bright, even lighting and a plain background reduce missed sightings. Seat the person under a focused light, gather a fine-toothed detection comb, and keep a small container nearby for anything you remove.
Begin with dry hair because a live louse may move before dampness slows it. Repeat the inspection with damp hair, which separates strands and makes small objects easier to see. Each pass offers a different view, so neither replaces the other.
Work Through Small Sections
- Part narrow sections: Start at the crown, behind the ears, and along the neckline.
- Inspect near the roots: Hold each section against a light background and look for crawling lice.
- Use the detection comb: Draw its teeth from the scalp toward the ends in short, steady passes.
- Wipe between passes: Clear the teeth so a stationary speck is not overlooked later.
- Check attachment carefully: Determine whether an oval object stays fixed to one hair or brushes away.
- Cover the full scalp: Repeat across several areas instead of relying on one distant glance.
Watch a suspected louse for several seconds. Legs and body segments identify an insect, while an attached oval shell indicates a nit. Empty shells can remain after an insect emerges, so repeated checks help you determine whether a finding is part of an active infestation.
The lice life cycle includes an egg stage, a nymphal stage, and adulthood. Eggs hatch in about 6 to 9 days, and nymphs develop for roughly 7 to 12 days. This timeline explains why fresh nits and moving young lice may appear at different points.
As the infestation develops, each stage’s mobility and preferred location can change.
Different Lice Favor Different Locations
Head lice grasp fine scalp hair and remain close to the roots. Body lice live mainly in clothing seams, where they leave the fabric to reach skin for blood-feeding behavior. Pubic lice favor coarse hair and have a broader outline than the elongated head louse.
Body lice may look tan to gray and resemble small crawling insects on bedding. Finding one on a seam, waistband, or collar changes the identification because body lice leave clothing to feed on nearby skin.
| Type | Appearance | Usual location |
|---|---|---|
| Head louse | Flattened, elongated, segmented body with six clawed legs | Scalp hair, especially near the roots |
| Body louse | Tan-to-gray insect resembling a small flea | Clothing seams and nearby skin |
| Pubic louse | Broader, rounded, crab-like outline | Coarse pubic or other body hair |
Nits from each type attach to nearby hair shafts. An attached egg on an eyebrow, for example, provides different context from one on scalp hair. A specimen preserved in a sealed container or a clear photograph can help a qualified adviser make a more reliable identification.
Uncertain Sightings Deserve a Careful Second Look
One suspected louse can still be confused with lint, a tiny insect carried outdoors, or a speck viewed under poor light. A live louse provides stronger evidence than nits alone, but repeated sightings, persistent symptoms, or an uncertain identification can justify professional advice.
Persistent scalp itching adds context, though the symptom alone cannot confirm lice. Itching may follow a new infestation, and eczema, irritation, bites, or another scalp condition can look similar. Combine crawling movement, attached nits, location, and symptoms before drawing a conclusion.
Keep uncertain findings for professional review rather than assuming every speck represents lice. Preserve a specimen or take a sharply focused image so its location, size, and attachment remain visible.
Clinical guidance emphasizes checking for live movement, attached eggs, and characteristic locations rather than relying on color alone. The Centers for Disease Control and Prevention provides identification information, while a healthcare professional, school nurse, or pharmacist can help determine the next step.
Seek medical advice for scalp redness, sores, crusting, severe discomfort, fever, or symptoms that continue despite appropriate management. A dermatologist may help when a scalp condition is difficult to distinguish from lice or itching persists without a confirmed sighting.
Final Look
Use three observations together: a live louse moves and has visible legs, a nit stays firmly attached to a hair shaft, and ordinary debris shifts or brushes away. Search the crown, hairline, neckline, and area behind the ears, then seek another qualified opinion when movement remains uncertain.
Appearance alone may not confirm whether a nit is viable. A single stationary speck can be an empty shell, loose debris, or an egg, so check several areas, use a detection comb, and look for live lice before deciding what to do next.
FAQ
What do head lice and nits look like?
Head lice are tiny, flattened insects with segmented bodies, six clawed legs, and tan, gray, or white coloring. Nits are oval objects firmly attached to hair shafts. They may appear white, yellow, or brown, but appearance alone cannot show whether an egg remains viable.
Are lice visible to the naked eye?
Yes. Adult lice are about 1/8 inch long, and nymphs are smaller. Bright lighting, a plain background, a hand lens, and a fine-toothed detection comb make them easier to see. Look for movement, legs, and a flattened segmented body rather than color alone.
What do lice eggs or nits look like?
Nits are oval and firmly cemented to a hair shaft. They may be white, yellow, or brown, while empty or hatched shells can look pale, translucent, or brown. No single color reliably shows whether a nit is viable.
How can I tell lice apart from dandruff or other hair debris?
A louse has visible legs, body segments, and crawling movement. A nit stays fixed to one hair, while dandruff, sand, lint, and product residue are loose or shift when brushed. Part the hair and examine one object at a time instead of judging a whole section by color.
What do body lice and pubic lice look like?
Body lice are tan-to-gray, elongated insects usually found in clothing seams and near the skin. Pubic lice have a broader, rounded, crab-like body and usually appear on coarse pubic or other body hair. Their preferred location helps distinguish them from head lice.
Where should I look for lice on the scalp and in the hair?
Part the hair near the roots and inspect the crown, behind the ears, the forehead and temples, and the back edge of the hairline. Include the neckline and the hair close to the scalp, since a view of the ends alone can miss insects and nits.
