Carpet Beetles: What They Look Like, the Larvae, Bites, and How to Get Rid of Them

What are carpet beetles?

Carpet beetles are small beetles in the family Dermestidae. Adults are round, about 1/16 to 1/8 inch (1.5 to 3 mm) long, and either black or speckled with white, brown and yellow scales. They eat pollen outdoors. Their larvae are the problem: fuzzy, slow grubs that eat wool, fur, feathers, silk and leather.

Several species live in homes. Most look like tiny speckled ladybugs, while the black carpet beetle is a little bigger and plain shiny black. Despite the name, they do not need carpet. The University of Kentucky lists sweaters, blankets, down pillows, upholstery, toys and mounted animal heads among the things the larvae eat.

The adults and the larvae tell you different things. Adults fly in from flowers and head for the windows, so a few are normal. Larvae live in dark corners, feed for months and do all the damage. So the larvae, not the beetles at the window, show whether you have a problem.

How big are carpet beetles?

Adult carpet beetles are 1/16 to 1/8 inch (1.5 to 3 mm) long, says the University of Kentucky. The black carpet beetle is the biggest common one, at 1/8 to 3/16 inch (3 to 5 mm). The larvae grow a little longer than the adults, to about 1/4 inch, and black carpet beetle larvae reach about 5/16 to 1/2 inch (8 to 13 mm).

Sizes from UC IPM, the University of Florida and Rutgers.

Do carpet beetles fly?

Yes, adult carpet beetles fly well, and that is how most of them get in. They fly to flowers for pollen, then in through open windows and doors, and indoors they fly toward the light. The larvae cannot fly. They have no wings and only crawl, slowly, which is why they stay close to their food.

Neither stage jumps. If a tiny dark bug jumps, it is more likely a flea or a springtail, and our guide to small black bugs in the house sorts those out.

Carpet beetle larvae: what they look like

Carpet beetle larvae are small, hairy grubs, about 1/8 to 1/4 inch (3 to 6 mm) long, tan to dark brown, that move slowly and hide in dark places. Some are banded and fuzzy, like a tiny woolly bear caterpillar. Others are smooth, golden and carrot-shaped with a tail of long hairs. Both kinds shed their skins as they grow.

The larva is the stage you are most likely to find, and the one that matters. It eats wool, fur, feathers, silk, leather, lint, pet hair and dead insects. It can feed for many months before it turns into a beetle. UC IPM notes that larvae prefer dark, secluded spots, so you find them under furniture, in closets and along baseboards.

• Varied carpet beetle larva: bands of light and dark brown, dense tufts of hair, and wider at the back than the front. When disturbed, it raises its tufts into a round plume (UC IPM).
• Furniture carpet beetle larva: white at first, then dark red or chestnut brown, and wider at the front (UC IPM).
• Common carpet beetle larva: reddish brown and carrot-shaped, covered in dark hairs (University of Florida).
• Black carpet beetle larva: shiny, smooth and firm, golden to dark brown, tapering to a tuft of long hairs at the tail (UC IPM, University of Maryland).

Each larva molts 8 to 17 times, according to Rutgers, and leaves an empty skin each time. Those skins look like the larva itself, hairs and all, but hollow and light. A handful of them is often the first thing people find. They also mean the larvae have been there a while.

Baby carpet beetles and “carpet worms”

A “baby carpet beetle” is a larva. Carpet beetles hatch from the egg as a tiny larva, not as a small beetle, and stay larvae until they pupate. People also call them carpet worms, carpet bugs or carpet larvae. They are not worms or maggots. Look closely and you will see six short legs near the head.

Types of carpet beetles

Four carpet beetles are common in American homes: the varied, the furniture, the common and the black carpet beetle. The first three belong to the genus Anthrenus and look alike as adults, small, round and speckled. The black carpet beetle, Attagenus unicolor, is bigger, plain and shiny. Their larvae differ more, which makes them the easiest way to tell the species apart.

Descriptions and larval times from UC IPM, CSU, Rutgers and the University of Florida (common carpet beetle and its life cycle).

Two relatives turn up too, and CSU Extension covers both. The warehouse beetle (Trogoderma variabile) is a slightly longer beetle, 3 to 4 mm, with wavy bands. Its larvae live in seeds, nuts, spices and cocoa. The larder beetle (Dermestes lardarius) is much bigger, 6 to 10 mm, with a wide yellow band across its back, and its larvae go for dried meat and pet food.

Black carpet beetle

The black carpet beetle is the largest common carpet beetle and, by Rutgers’ count, the most common one in the US. Adults are 1/8 to 3/16 inch (3 to 5 mm), oval, and shiny black or dark brown with brown legs. The larvae are golden to dark brown, smooth and carrot-shaped, with a tuft of long hairs at the tail.

It eats more than wool. UC IPM says that in California and other dry areas, it is a bigger pest of stored food, such as flour, grain and cereal, than of fabric. So a tiny black beetle in the pantry or on the windowsill may well be this one. If the black beetle you found is bigger than 1/4 inch, it is something else. Our black beetle identification guide sorts the larger ones by size.

Carpet beetle eggs

Carpet beetle eggs are white, oval and tiny. The University of Florida measures furniture carpet beetle eggs at about 0.35 by 0.75 mm, roughly 1/32 inch long. Each female lays about 40 to 90, in cracks, lint and carpet edges next to food, and the eggs hatch in about 1 to 3 weeks. Florida says they are visible on close inspection, but most people never notice them.

Rutgers lists the usual places: lint around baseboards, carpet edges, cracks, hot-air furnace ducts and dead mice. UC IPM adds wool rugs, furs, stuffed animals, leather book bindings and feathers. In short, the female lays them right on the larvae’s future food.

What people call “carpet beetle egg sacs” are almost always shed larval skins, or the empty skin a beetle leaves when it emerges. UC IPM notes that larvae may pupate inside their last larval skin. No extension source we read describes an egg sac, so those hollow, bristly shells are skins.

Eggs can be on clothes, especially stored wool and fur. The University of Kentucky says larvae like to feed in folds such as hems, collars and cuffs. Hot washing, dry cleaning or a hot dryer kills the eggs, according to Kentucky and UC IPM.

Signs of carpet beetles

The main signs of carpet beetles are adult beetles on windowsills in spring, fuzzy larvae in dark corners, hollow bristly skins, droppings the size of a grain of salt, and holes or bare patches in wool, fur or felt. Shed skins and larvae matter most, because they mean beetles are breeding indoors.

• Adults at windows. Small round beetles on the sill, drapes or glass, often in spring. A few are normal, says UC IPM. Many, week after week, point to larvae indoors.
• Live larvae. Fuzzy or carrot-shaped grubs under furniture, along baseboards, and in closets, vents and drawers. The University of Maryland notes they avoid light, so look underneath things.
• Shed skins. Light brown, hollow and bristly, in the shape of the larva. UC IPM says these skins, plus no webbing, are usually good clues that carpet beetles did the damage.
• Droppings. Tiny pellets about the size of a grain of salt near where larvae feed (UC IPM). This is what “carpet beetle poop” looks like.
• Damage. Holes, thin spots or grazed patches in wool, fur, felt, silk or feathers, often in one area rather than scattered.
• Itchy bumps. A rash with no bites to explain it can come from larval hairs. It is a clue, never proof, as the bite section below explains.

There is no nest. Searches for a “carpet beetle nest” are really asking where the source is. Larvae gather around one food supply, such as a wool rug, a bag of pet food or a dead mouse, and that cluster is what people call a nest. Finding it is the whole job, and the source section below shows where to look.

Carpet beetle damage or clothes moth damage?

Look for silk. Clothes moth larvae leave webbing or silk cases on the fabric, while carpet beetle larvae leave none, only shed skins and pellets. The pattern differs too. UC IPM says carpet beetles tend to eat a large area in one part of a garment or rug, while moth damage more often shows as scattered holes.

Clues from UC IPM, the University of Florida and the University of Kentucky.

They are the bigger fabric pest of the two. Rutgers says they cause more damage to carpets, rugs and other woolens than clothes moths do. If you do find silk, our guide to clothes moths and their larvae covers the moths in full.

I found one carpet beetle. Is it an infestation?

One adult carpet beetle is not an infestation. UC IPM says a few adults indoors should not be cause for alarm, since they fly in from flowers all the time. What counts is larvae. Act when you find larvae, shed skins or fresh damage, because those mean beetles are breeding inside your home.

Our rule of thumb, built from UC IPM, Kentucky and CSU guidance. No source sets an official count for an infestation.

Do carpet beetles bite? Are they harmful?

No, carpet beetles do not bite. Neither the adults nor the larvae feed on people or pets, and a CDC journal report states that the larvae “never infest living animals”. The problem is their hairs. The larvae carry tiny spear-tipped hairs, and in some people these cause an itchy rash that looks a lot like bites.

Scientists call these spear-headed hairs hastisetae. A 2021 review by Ruzzier and colleagues explains that they are a defence, because they tangle up small invertebrate predators such as mites. Penn State notes that Anthrenus larvae carry them, which takes in the varied, furniture and common carpet beetles, and the review adds warehouse beetle larvae.

On people, the hairs can cause carpet beetle dermatitis. Penn State Extension says doctors have described it since 1948, with intense itching, small bumps and blisters. Some people also get eye and airway irritation. Penn State says it mainly affects people who become sensitised through long-term exposure, often over years.

It is easy to mistake for bed bug bites. In a 2021 report in Emerging Infectious Diseases, French doctors traced a rash in seven families to carpet beetle larvae in clothing and upholstery. The marks were mostly under clothing, and the authors wrote that the condition is often missed or blamed on bed bugs or fleas.

A rash alone cannot tell you which insect, if any, is to blame, and neither can a photo of it. Look for the insect itself: larvae, shed skins, or the blood spots that bed bugs leave. Our bug bite identification guide covers the insects that do bite indoors.

Is it safe to sleep in a room with carpet beetles?

Yes. They do not bite or feed on blood, and the larvae do not live on people. If you have itchy bumps, wash your bedding in hot water, vacuum around and under the bed, and look for larvae in nearby wool blankets, down pillows or rugs. You can keep sleeping there while you clear them.

Carpet beetles and pets

They do not bite cats or dogs. The real issues are what pets bring and what people spray. Pet hair, wool pet beds and spilled dry food all feed larvae, so vacuum and seal those first. And some home remedies are dangerous: Pet Poison Helpline lists peppermint, clove, cinnamon and tea tree oils among those known to poison cats.

Bugs that look like carpet beetles

The bugs most often mistaken for carpet beetles are bed bug nymphs, fleas, booklice, drugstore beetles and lady beetles. For the larvae, add duff millipedes and clothes moth caterpillars. Check three things: is it hairy, does it have a hard shell, and where did you find it? Fuzzy and slow near wool or lint points to a carpet beetle larva.

Duff millipede details from CSU Extension, which notes they are about 1 mm long and can be mistaken for carpet beetle larvae. Clothes moth details from UC IPM and Kentucky Entfact-609. Bed bug details from our bed bug guides.

The adults get confused with a few other beetles too. Lady beetles have the same rounded shape, says UC IPM, but are much bigger and usually red or orange with spots; see our ladybug vs Asian lady beetle guide. Drugstore beetles turn up in pantries and spider beetles in dark corners, and both are look-alikes worth ruling out. Pale, soft specks on damp paper are more likely booklice, covered in our tiny white bugs guide.

Carpet beetle or bed bug?

The fastest test is blood. Bed bugs feed on blood and leave rusty spots and dark stains on sheets and mattress seams, and carpet beetle larvae never do. Bed bug nymphs are smooth, flat and reddish, while carpet beetle larvae are hairy and banded. The adult beetles also have a hard, speckled shell that bed bugs lack.

Still unsure? Our bed bug identification guide with photos shows every bed bug stage, egg to adult, at real size.

Are “carpet mites” real?

No extension service we checked lists a pest called a carpet mite. People who search for one have usually seen carpet beetle larvae, which are small enough to pass for mites. Or they are thinking of house dust mites. Dust mites do live in bedding and carpet, but the University of Nebraska says they are virtually invisible without magnification and do not bite. If you can see it crawling, it is not a dust mite.

Where do carpet beetles come from?

Carpet beetles come from outdoors. Adults feed on flower pollen, then fly in through open windows and doors or ride in on cut flowers. Inside, females lay eggs wherever larvae can eat: wool, fur, feathers, lint, pet hair, dead insects and old nests. CSU Extension adds that beetles also arrive in infested furniture and food.

UC IPM names the flowers they like: crape myrtle, spiraea and buckwheat, all plants with plenty of pollen. Rutgers adds Queen Anne’s lace, daisies and wild asters. Outdoors, UC IPM and CSU say the larvae live in bird, wasp and bee nests, spider webs and animal dens, feeding on feathers, hair and dead insects.

What causes carpet beetles indoors is food the larvae can reach and nobody disturbs. A wool rug under a couch, a forgotten fur hat, a bag of dry dog food, years of lint in a heating vent or a dead mouse in a wall all qualify. The University of Kentucky notes that items in regular use, and rugs vacuumed often, are seldom attacked.

Having carpet beetles does not mean your house is dirty. Spotless homes get them too, because UC IPM says adults often fly in from flowers in the yard. Lint and clutter do help them settle in, though, so cleaning is part of the cure.

You also do not need carpet to get them. Despite the name, the larvae eat any animal fibre or debris they find: clothes, blankets, upholstery, pet hair, stored food and the lint that collects along hard floors.

How to find the source, room by room

Finding the source ends most carpet beetle problems. Larvae stay near their food, so start in the room where you see the most larvae or skins, and work through the list below with a flashlight. Forum posts from people who finally solved it name the same places again and again: pet food, light fixtures, wall voids, a couch, a box spring.

• Bedroom and closets. Wool sweaters, scarves and coats, especially hems, collars and cuffs (Kentucky). Down comforters, feather pillows, wool blankets, boxes under the bed, and the box spring.
• Living room. Under the couch and heavy furniture. Upholstery stuffed with hair or feathers (UC IPM). Wool rugs, especially their edges and undersides (Kentucky). Piano felts and hammers, which UC IPM says larvae can infest badly enough to affect the tone.
• Floors and walls. Lint and hair along baseboards and in heating vents and ducts. Under the edge of wall-to-wall carpet, which Kentucky suggests lifting off the tack strip with needle-nose pliers.
• Ceilings and lights. Dead insects inside light fixtures and ceiling fans. Kentucky names dead cluster flies, lady beetles, stink bugs and wasps as larval food.
• Kitchen and pantry. Dry pet food, birdseed, flour, cereal and spices (UC IPM, Kentucky). Rodent food stores behind appliances and inside walls (CSU).
• Attic, garage and eaves. Bird, wasp, bee and rodent nests, old spider webs, dead insects, and stored wool, furs or mounted animals (UC IPM, Kentucky).
• Kids’ rooms. Felt and yarn crafts, and wool or fur toys. UC IPM pictures larvae in a child’s art project made of yarn, noodles and beans. Synthetic plush toys are not food unless stained.

If you still cannot find it, put sticky traps along the baseboards of each room for a week. UC IPM says traps placed throughout a building can show where beetles are coming from. Then search hardest in the room with the biggest catch.

Carpet beetles in your bed or mattress

Carpet beetle larvae in a bed are usually passing through, or feeding on something in or near it: a wool blanket, a down comforter, feather pillows, or lint and hair under the bed. UC IPM says they do not feed on synthetic fibres, so a foam or synthetic mattress is not food. You do not need to throw it out.

Wash the bedding hot and dry it on high heat. Vacuum the mattress seams, the bed frame and the floor under the bed. A mattress or pillow stuffed with hair or feathers is a different case. UC IPM warns that spraying the outside will not reach larvae inside, and a fumigation firm can treat it.

Carpet beetles in your car

Carpet beetles in a car come from the same things as in a house: forgotten clothes or blankets, wool or sheepskin seat covers, pet hair and food crumbs, often in a car that sits for weeks. No extension service has a car-specific guide, so the house rules apply. Take everything loose out, vacuum the seats, seams, floor mats and trunk, and wash or freeze any fabric that was inside.

Carpet beetle life cycle

Carpet beetles go from egg to larva to pupa to adult, and the larva takes up most of that time. Eggs hatch in 1 to 3 weeks. The larva then feeds for anywhere from about 2 months to nearly 2 years, depending on the species, the warmth and the food. The pupa lasts about 1 to 3 weeks, and adults live 2 to 8 weeks.

From UC IPM, at typical indoor temperatures. Other sources give wider ranges: the University of Florida says larval growth can take up to three years.

Two facts explain why an infestation can feel endless. The larvae can feed for well over a year, and CSU says they can survive several weeks with no food at all. Also, because a larva molts 8 to 17 times, one larva can leave a trail of skins that looks like a crowd.

When carpet beetles are most active

Adults show up indoors mainly in late winter, spring and early summer, when they head for windows and flowers. Larvae feed all year in a heated home. CSU says adults and wandering larvae appear most often in late winter and early spring, while UC IPM says varied carpet beetle adults usually appear in spring or early summer.

Our summary of UC IPM, CSU and Kentucky timing. CSU notes that Anthrenus carpet beetles spend the winter as larvae or pupae. Indoor warmth can shift every stage.

Will carpet beetles go away on their own?

Not while they have food. A larva can keep feeding for a year or more, and adults that emerge indoors can lay their eggs on the same food. The problem ends only when the food source is gone or treated. Fewer adults at the window in summer does not mean the larvae are gone.

How to get rid of carpet beetles

To get rid of carpet beetles, find and remove what the larvae are eating, then vacuum thoroughly and kill the rest with heat or cold. Throw out badly infested items, wash or dry-clean fabrics, freeze what you cannot wash, and store clean wool in sealed containers. Use an insecticide only on spots you cannot clean.

This order starts with what costs nothing. UC IPM calls carpet beetles among the hardest indoor pests to control, because they find food in obscure places and spread through a building. Yet it also says plainly: “If exclusion and sanitation are successful, insecticide treatments are not required.”

Getting rid of carpet beetle larvae

The steps above are how you get rid of carpet beetle larvae, since larvae are what you are treating. Vacuum them up rather than spraying them, because they hide inside fabric where sprays do not reach. Then deal with their food, not just the larvae you see, or new eggs will hatch on it.

Larvae on walls and ceilings are usually on the move. UC IPM says that when they are ready to pupate, they may wander off and burrow somewhere else. So vacuum them, then check the light fixtures, vents and shelves above and around where you found them.

What temperature kills carpet beetles?

Heat or cold kills every stage of carpet beetle, eggs included, if it lasts long enough. UC IPM says 120°F (49°C) for at least 30 minutes, or freezing below 18°F (-8°C) for 2 weeks. The University of Kentucky says 0°F (-18°C) for at least a week, or -20°F (-29°C) for 72 hours. Sources differ, so use the longer time when unsure.

Thick or large items take longer to heat or chill all the way through, CSU notes, so give them extra time.

Our reading: two weeks in a sealed bag in a home freezer at 0°F (-18°C) meets the UC IPM, Kentucky and Rutgers advice. Let it warm up inside the bag before you open it. Heat is riskier for wool, leather, glue and plastic, and UC IPM says to consider whether heat or cold will damage an object first. Test it, or skip it on anything valuable.

Protect clothes and heirlooms in storage

Clean first, then seal. Moth flakes and crystals help only inside an airtight container. The National Pesticide Information Center explains that mothball labels direct you to use them in a tightly closed container, where the vapour builds up. In an open closet, it escapes into your home instead.

UC IPM adds that the product must be labelled for carpet beetles and must not touch plastic buttons, hangers or garment bags, which it can soften. Kentucky warns never to scatter mothballs where children or pets can reach them.

Cedar is weak protection. UC IPM calls its effect debatable: the oil can kill small larvae but not large ones, and it fades as the wood ages. The University of Florida says cedar over 36 months old is useless. A tight lid matters more than the wood. For furs and costly wool, cold storage at 40 to 42°F (4.5 to 5.5°C) protects items for long periods, according to Florida.

Insecticides, last and only where needed

If cleaning, washing and freezing are working, skip insecticides. If larvae keep turning up in places you cannot clean, use a product whose label lists carpet beetles, as a spot treatment. UC IPM limits it to carpet edges, under rugs and furniture, closet floors and walls, shelves, and cracks and crevices. Never spray clothing or bedding.

For attics and wall voids, UC IPM suggests an insecticidal dust such as silica aerogel, applied with care so you do not breathe it in. CSU lists pyrethroid sprays, such as permethrin and bifenthrin, for cracks, baseboards and carpet edges in rooms without food. If you use diatomaceous earth, choose an EPA-registered product whose label lists carpet beetles, puff a thin film into cracks only, and avoid breathing the dust. Do not spread it across carpets.

What does not work

Many popular fixes do little or carry risks. Foggers, vinegar, essential oils, baking soda and piles of diatomaceous earth all get recommended online, but no extension source we read supports them. Here is what the evidence says instead.

• Myth 1

  “A bug bomb will clear them out.”

  Truth: CSU says household bug bombs are not effective, and Rutgers explains that the fog does not reach larvae in hiding.

• Myth 2

  “Vinegar, lavender or peppermint oil kills or repels them.”

  Truth: No extension guide we read recommends them, and none cites evidence. Essential oils can also hurt pets: Pet Poison Helpline lists peppermint, clove and cinnamon oil among those that poison cats.

• Myth 3

  “Baking soda on the carpet kills the larvae.”

  Truth: No extension source we read recommends it, and we found no evidence that it works. A vacuum does the job people hope baking soda will.

• Myth 4

  “Sprinkle diatomaceous earth or boric acid over the carpet.”

  Truth: Spreading dust across a room is not how labels direct it. If you use a dust, choose one whose label lists carpet beetles, puff a thin film into cracks only, and avoid breathing it.

• Myth 5

  “Rubbing alcohol is a safe home fix.”

  Truth: It is flammable, and this site does not recommend it for any pest. Hot washing and freezing kill larvae with no fire risk.

• Myth 6

  “Spraying the beetles at the window solves it.”

  Truth: Adults do no damage and live only a few weeks. The larvae, hidden near their food, are the ones to find.

How to keep carpet beetles out

To keep carpet beetles out, stop the adults getting in and give larvae nothing to eat. Keep window screens tight, check cut flowers before bringing them in, vacuum edges and vents regularly, and store clean wool in sealed containers. Most of this costs nothing and also protects against clothes moths.

• Fix screens and gaps around windows, doors and vents (UC IPM).
• Check cut flowers for beetles outdoors before you bring them in (UC IPM).
• Vacuum under furniture, along baseboards and in closets every week or two.
• Clean wool, fur and silk before you store it, then seal it (Kentucky).
• Air and brush stored woolens in the sun once a year, as UC IPM suggests.
• Keep pet food, birdseed and flour in sealed containers.
• Remove empty bird, wasp and rodent nests from the attic, eaves and chimney.
• Clear dead insects out of light fixtures and window tracks.

The same habits keep pantry pests down too. Bugs that eat paper and starch in damp rooms are a different problem, covered in our silverfish guide.

When to call someone

Most carpet beetle problems are a do-it-yourself job. Call a licensed pest professional if larvae keep appearing after several weeks of cleaning, if the source is in walls or an attic you cannot reach, or if furniture stuffed with hair or feathers is infested. UC IPM notes that fumigation, the fix for stuffed items, is for licensed operators only.

• A pest professional for wall voids, attics, stuffed furniture, heavy infestations, or apartment buildings, where Rutgers says crawling larvae make treatment harder.
• Your landlord if you rent and the source is in a shared wall, attic or vent you cannot reach.
• A dry cleaner or rug cleaner for wool rugs and coats you cannot wash. UC IPM says area rugs can go to cleaners who handle rugs.
• A piano technician or conservator for damaged piano felts, mounted animals, quilts and other heirlooms.
• A doctor for a rash that is severe, spreading or will not settle, or any trouble breathing.

Not sure it is a carpet beetle at all? Take a sharp photo from above and run it through our bug identifier by picture before you buy anything.

Pest control disclaimer. Photo-based identification can help, but it is not always perfect. For dangerous spiders, large infestations, or anything you are unsure about, contact a licensed pest control professional.

Medical disclaimer. This page is for general information only. It is not a medical diagnosis. If you have severe symptoms, trouble breathing, swelling of the face or throat, fast spreading redness, fever, severe pain, pus, or signs of infection, contact a doctor or your local emergency number.