Carpet Beetles: What They and Their Larvae Look Like, Do They Bite, and How to Get Rid of Them
Carpet beetles are round, 2 to 5 mm beetles that fly to windows; the damage comes from their hairy, striped larvae in carpets, wardrobes and lint. How to identify adults and larvae, tell them from bed bugs, recognise the rash, and get rid of them for good.
Carpet beetles are small, round beetles, 2 to 5 mm long, that you usually notice on a windowsill in spring: either mottled white, brown and yellow (varied carpet beetle) or plain shiny black (black carpet beetle). The adults are harmless and feed on pollen outdoors. The problem is their larvae: hairy, striped, slow-moving grubs 3 to 13 mm long that live in dark, undisturbed places and eat wool, fur, feathers, silk, leather, pet hair and lint. Carpet beetles do not bite, but the larvae's bristles cause an itchy rash on some people that is often mistaken for bed bug bites.
If you have found adults at the window, there are larvae somewhere in the house. The rest of this guide is how to find them and what actually gets rid of them.
Carpet beetle identification at a glance
| Species | Adult | Larva | Where common |
|---|---|---|---|
| Varied carpet beetle (Anthrenus verbasci) | 2 to 3.5 mm, round, mottled white, brown and yellow scales | Up to about 5 mm, plump, banded light and dark brown, dense hairs with three tufts at the rear | US, UK, Europe, Australia; the most common species in homes |
| Common carpet beetle (Anthrenus scrophulariae) | 2.5 to 3.5 mm, black with white scales and a reddish band down the middle of the back | Like the varied carpet beetle | US, Europe |
| Furniture carpet beetle (Anthrenus flavipes) | 2 to 3.5 mm, mottled black, white and yellow, slightly more rounded | Like the varied carpet beetle | US (especially the South), warm regions |
| Black carpet beetle (Attagenus unicolor and relatives) | 3 to 5 mm, oval, shiny black to dark brown, no pattern | Up to about 13 mm, carrot-shaped, smooth golden to dark brown with a long tail of hairs | US, Europe, Australia; also eats dry foods |
The two larva types look different enough that people think they have two pests. Anthrenus larvae (varied, common, furniture) are the classic "woolly bears": short, fat and fuzzy, with stripes across the body. Black carpet beetle larvae are longer, shinier and tapered like a carrot, with a tuft of hair at the tail end almost as long as the body.
What carpet beetle larvae look like
Carpet beetle larvae are the stage that does the damage and the one you are least likely to see, because they avoid light. What to look for:
- Shape and size: 3 to 5 mm and oval (varied type) or up to 13 mm and carrot-shaped (black type), about the size of a grain of rice at most.
- Colour: brown, with alternating light and dark bands across the body.
- Hair: visibly bristly or fuzzy, especially at the rear. Under a magnifying glass, varied carpet beetle larvae raise tufts of hair when disturbed.
- Movement: slow crawling, often curling up when touched.
- Shed skins: larvae moult many times, so you often find the hollow, hairy, striped husks before you find a live one. Shed skins in a drawer, along a carpet edge or under a bed are one of the most reliable signs.
Where they live: under furniture and beds, along carpet edges and under rugs, in wardrobes and drawers (wool, cashmere, silk, feathers, fur), in stored clothes and blankets, inside air ducts and vents where lint collects, in pet bedding, behind skirting boards, and in old bird, wasp or rodent nests in the attic or wall spaces. Black carpet beetle larvae also turn up in pantries, in flour, cereal, dried pet food and spices.
The adults live only a few weeks. Most species take a year or more to go from egg to adult, and almost all of that time is spent as larvae, which is why an infestation can grow quietly for a long time.
Signs of carpet beetles
- Adults on windowsills, curtains or light fittings, mostly in spring and early summer. Adults are attracted to light and want to get outside to feed on flowers.
- Irregular holes in natural fabrics, often on hidden parts: under the collar, in folds, along seams, on the underside of a rug.
- Bare, grazed patches in wool carpet, usually along walls, under furniture and in corners that the vacuum misses.
- Shed skins and tiny droppings (sand-like grains, smaller than a pinhead) where the larvae feed.
- Larvae in lint, in vents, under the fridge, in the gap between floorboards.
Clothes moths cause similar holes. The difference: moth larvae spin silk, so you find webbing, silky tubes or cases on the fabric. Carpet beetles leave no silk, only shed skins.
Do carpet beetles bite?
No. Neither the adults nor the larvae bite or suck blood. What happens instead is carpet beetle dermatitis: the larvae carry barbed hairs that break off and can irritate the skin of sensitive people. The result is itchy red bumps or welts, sometimes in a line or a patch, usually on skin that touched bedding, clothes or upholstered furniture where larvae live. It looks a lot like bites, which is why it so often gets blamed on bed bugs.
Clues that a rash is carpet beetles rather than a biting insect:
- No bug is ever found in the bed, but shed skins or larvae turn up in the bedroom, wardrobe or carpet.
- The rash appears after handling stored clothes, blankets or a rug, not only after sleeping.
- There are no bed bug signs: no ink-dot droppings on the mattress seams, no rust-coloured smears, no live flat brown bugs.
- Other people in the house are unaffected (only some people react to the hairs).
Not everyone reacts, and most reactions are mild. Wash the skin with soap and water, avoid scratching, and use a cold compress or an over-the-counter hydrocortisone cream or oral antihistamine for the itch, following the label. See a doctor if the rash is widespread, blistering, infected, or not improving after a week or two, and get help at once for any swelling of the face or trouble breathing. A doctor can also rule out scabies, which causes a similar itch and needs prescription treatment. Our bug bite identifier compares the rash with real bites.
Carpet beetle vs bed bug
| Carpet beetle adult | Carpet beetle larva | Bed bug | |
|---|---|---|---|
| Size | 2 to 5 mm | 3 to 13 mm | 4 to 7 mm (adult) |
| Shape | Round, domed | Oval or carrot-shaped, hairy | Flat, oval, like an apple seed |
| Colour | Mottled or black | Brown, banded | Reddish brown, plain |
| Flies? | Yes | No | No |
| Where | Windows, curtains | Carpets, wardrobes, lint | Mattress seams, bed frame, headboard |
| Feeds on | Pollen | Wool, fur, feathers, lint | Human blood |
| Skin reaction | None | Rash from hairs (some people) | Itchy bites, often in lines or clusters |
| Leaves | Nothing | Shed hairy skins, fabric holes | Ink-dot droppings, blood smears, pale shed skins |
The quickest test is shape. A bed bug is flat enough to slide into a credit-card crack; a carpet beetle adult is round like a tiny ladybird, and a larva is fuzzy. If you still are not sure, look at our bed bug pictures, which show a varied carpet beetle next to the real thing, or photograph it and let Bug Identifier confirm which one you have.
How to get rid of carpet beetles
Killing the adults at the window does nothing on its own. You have to find and remove the larvae and their food.
1. Find the source. Start with the rooms where you saw adults, then check wardrobes, drawers, stored wool and blankets, under beds and heavy furniture, carpet edges, under rugs, inside vents and behind radiators. Look in the attic and wall voids for old bird or wasp nests and dead insects; a nest is a common hidden source. In the kitchen, check old flour, cereal, pet food and spices.
2. Vacuum thoroughly, and keep doing it. Vacuum carpets right up to the skirting boards, under furniture, inside wardrobes, upholstered furniture, curtains, vents and the gaps between floorboards. Vacuuming removes larvae, eggs, shed skins and the lint they feed on. Bin the bag or empty the canister outside straight away. Repeat weekly for at least a month or two.
3. Clean what is infested. For washable items, wash in the hottest water the fabric allows and tumble dry on high heat for at least 30 minutes. Dry-clean what cannot be washed. Freezing works for items that cannot take heat: seal them in a bag and keep at -18 °C (0 °F) or colder for at least a week, then let them warm up slowly before opening the bag. Throw away anything badly damaged or infested food.
4. Store natural fibres sealed. Put clean wool, cashmere, silk, fur and feathers in airtight plastic bins or zip bags. Larvae cannot eat what they cannot reach, and clean clothes are less attractive than worn ones with sweat or food stains. Cedar has only a weak effect on carpet beetles and will not stop an infestation. Avoid mothballs in living areas: the vapour is a health risk and is only effective in a fully sealed container.
5. Treat the hiding spots if needed. Where vacuuming is not enough, an insecticide labelled for carpet beetles can be applied as a spot treatment to carpet edges, cracks and under furniture. Follow the label, keep children and pets away until it dries, and never spray clothes or bedding. Diatomaceous earth along carpet edges is an option some people prefer.
6. Keep the adults out. Screen windows, check cut flowers before bringing them in (adults ride in on blossoms), and remove bird nests from eaves and vents.
Call a professional if you find larvae in several rooms, the damage keeps spreading after two months of vacuuming, or the source is inside a wall, attic or duct you cannot reach. Museums, collectors and anyone with valuable rugs or taxidermy should also get professional help early.
Regional notes
The varied carpet beetle is the most common household species in the US, the UK and much of Europe and Australia; in the UK its larvae are the "woolly bears" that also damage museum collections. In the southern US and other warm regions the furniture carpet beetle is common too. Black carpet beetles occur worldwide and are the ones most often found in pantries. Adults show up indoors mainly from spring to early summer in temperate climates, which is also when searches for carpet beetles peak.
Frequently Asked Questions
What do carpet beetles look like?
Adults are round, domed beetles 2 to 5 mm long. The varied carpet beetle is mottled with white, brown and yellow scales; the black carpet beetle is shiny black or dark brown and slightly more oval. Larvae are brown, striped and hairy, 3 to 13 mm long.
Do carpet beetles bite humans?
No. Carpet beetles do not bite or feed on blood. Their larvae have barbed hairs that can cause an itchy, bite-like rash on sensitive people, known as carpet beetle dermatitis.
Where do carpet beetles come from?
Adults fly in through open windows and doors or ride in on cut flowers, then lay eggs on wool, fur, feathers, lint, dead insects or old nests. They can also arrive as larvae in second-hand rugs, furniture or clothing.
Are carpet beetles a sign of a dirty house?
No. They are common in clean homes, because lint, pet hair and wool are everywhere. They do thrive where carpet edges, wardrobes and stored items are rarely vacuumed or disturbed.
How long does it take to get rid of carpet beetles?
Expect at least one to two months of regular vacuuming and cleaning, because eggs keep hatching and larvae hide deep. You may see a few adults at the windows the following spring; if there are no new larvae or damage, they are the last of the old population.
Can carpet beetles live in your bed?
Larvae can live under the mattress, in the bed frame and in wool or down bedding, but they do not feed on people. If you find hairy, striped larvae or husks in bedding, wash the bedding hot and vacuum the mattress and bed frame.
The short version
Round little beetles at the window in spring mean carpet beetles, and the larvae are the real problem: hairy, striped, slow, hidden in wardrobes, under furniture and in lint. They do not bite, but their hairs can cause a rash that looks like bed bug bites. Find the source, vacuum weekly for a couple of months, wash, freeze or dry-clean what they have reached, and store natural fibres sealed. If you find a small beetle or a fuzzy larva and want to be sure what it is, take a photo with Bug Identifier for the species and the next step. For other small bugs you might find on the sill or in the carpet, see tiny black bugs in the house and our house bug identifier.
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