Do Cockroaches Bite? What a Roach Bite Looks Like and What to Do

Yes, cockroaches can bite people, but it is rare. Roaches are scavengers with chewing mouthparts, not blood feeders, and they avoid people when they can. Bites happen almost only in heavy infestations where food is short, and almost always at night on someone asleep: the fingertips and nails, the hands, the feet and toes, the eyelashes, or the skin around the mouth, where food residue and dead skin attract them. A cockroach bite is a small red bump, sometimes with a scraped or scabbed centre, usually single or a few scattered ones. It is not venomous. The real risks are a skin infection and, far more common than any bite, allergy and asthma from the roaches themselves.

If you woke up with bites and you have roaches, the roaches are still not the most likely suspect. Bed bugs, fleas and mosquitoes bite far more often. Here is how to tell which one it was and what to do.

Do cockroaches bite? The short answers

Reports of cockroaches nibbling sleeping people go back over a century. Entomologists Louis Roth and Edwin Willis collected them in their 1957 Smithsonian review of the medical importance of cockroaches: sailors on ships with heavy infestations found their nails and the calluses on their hands and feet chewed, and some wore gloves to bed. Modern case reports are the same pattern, in homes where roaches are numerous enough to be seen in daylight.

What does a cockroach bite look like?

There is no field mark that proves a bite came from a roach, so treat these as clues, not a diagnosis:

• Size and shape: a small red bump, a few millimetres across, sometimes a little larger than a mosquito bite once it swells.
• Centre: often a scraped, raw or scabbed spot rather than a single pinprick, because roaches chew rather than pierce. On nails and calluses there may be nothing but a ragged edge.
• Number: one or a few, scattered. Not the neat line or cluster of three that bed bugs leave.
• Location: fingertips, around the nails, the sides of the hands and feet, toes, lips and eyelids. Places with food residue or thick dead skin.
• Feel: mild pain or soreness more than itch. Some people react with more swelling and itching, the same way they react to other insect bites.
• Context: you have a lot of roaches. Signs are droppings like ground pepper or coffee grounds, egg cases, a musty smell and roaches out in daylight. Cockroach poop and eggs shows what to look for.

Not sure the bug you are seeing is a roach? Compare it with the six species in pictures of roaches for identification, or photograph it and let Bug Identifier name the species.

Cockroach bite vs bed bug, flea, mosquito and spider bites

For the full comparison of the three most common night biters, see bed bug bites vs mosquito vs flea bites. If none of these fit, What bit me? narrows it down by pattern, place and timing.

One more lookalike: kissing bugs are dark, flat and roach-sized, and they do bite people around the mouth at night. They have a long cone-shaped head and thin straight beak; a cockroach's head is hidden under the shield-shaped pronotum when seen from above. If you are in the southern US and the bug fits, read that guide before you throw the bug away.

Which cockroaches bite?

• American cockroach (Periplaneta americana, 35 to 40 mm, reddish brown with a pale band around the pronotum): the species named in most bite reports, mostly in sewers, ships, basements and badly infested buildings.
• Australian cockroach (P. australasiae, 30 to 35 mm, yellow stripes on the shoulders of the wings): common in Australia and the southern US; same behaviour as the American.
• Smokybrown cockroach (P. fuliginosa, 30 to 38 mm, uniform dark mahogany): southern US, Japan and Australia; comes inside in summer.
• German cockroach (Blattella germanica, 12 to 15 mm, two dark stripes behind the head): the most common indoor roach worldwide. Its mouthparts are small, but infestations can reach thousands, and in the worst ones they too are reported nibbling people.
• Oriental and brown-banded cockroaches: rarely mentioned in bite reports.
• Baby cockroaches (nymphs): their mouthparts are small and they very rarely break skin. Finding many nymphs does mean a breeding population, which is the situation where bites happen.
• Pet roaches (Madagascar hissing, dubia): docile and not known as biters.

Regional notes: in the UK and northern Europe the household roaches are German and Oriental; in Australia, the American, Australian and German; across the US South, all six large and small species. Which one you have also tells you how to get rid of it; see the cockroach identifier.

Are cockroach bites dangerous?

The bite itself is minor. Three things make roaches a health problem anyway:

1. Infection. Cockroaches walk through drains, garbage and droppings and carry bacteria such as Salmonella and E. coli on their bodies. A bite that breaks the skin can get infected like any small wound.
2. Allergy and asthma. Proteins in roach droppings, saliva and shed skins are a well-documented trigger of allergies and asthma, especially in children living in infested homes. This is the most common way roaches make people ill, bite or no bite.
3. Allergic reaction to the bite. Some people swell and itch more than others. A severe whole-body reaction is very unlikely, but treat it as an emergency if it happens.

How to treat a cockroach bite

1. Wash the bite with soap and running water and pat it dry.
2. Cool it: a cold pack or cold cloth for 10 minutes eases swelling and soreness.
3. Ease the itch: over-the-counter hydrocortisone cream or an oral antihistamine, used as the label says. Do not scratch.
4. Cover an open or scraped bite with a plaster until it closes, and keep it clean.
5. Watch it for a few days.

When to see a doctor

• Redness that spreads, warmth, swelling that keeps growing, pus, red streaks or a fever: signs of a skin infection.
• A bite on the eyelid or close to the eye that swells.
• Bites that keep appearing and you cannot find the cause.
• Call emergency services for trouble breathing, swelling of the face, lips or tongue, or dizziness after any bite.

Bites in a baby or a person who cannot move easily (bedridden, elderly, a resident in care) are a sign of a severe infestation that needs dealing with straight away.

How to stop roaches biting

Roaches bite when there are a lot of them and not enough food, so the fix is the infestation, not a repellent on your skin.

• Wash hands and face before bed, and do not eat in bed. Food residue on skin is what draws them.
• Keep food out of the bedroom, including pet food, wrappers and dirty dishes.
• Cut off water: fix drips, dry the sink at night, cover drains.
• Use gel bait and bait stations along the edges where you see droppings, plus an insect growth regulator for German cockroaches. Sprays scatter roaches and can make baits less effective.
• Seal gaps around pipes, behind the fridge and the stove, and under doors.
• Call a professional if you see roaches in daylight, find many nymphs, or have bites. That is a heavy infestation.

Frequently Asked Questions

Do cockroaches bite humans while they sleep?

Rarely, and nearly always in heavy infestations. Roaches that are short of food can nibble the fingertips, nails, feet, eyelashes and the skin around the mouth of someone asleep. A home with a few roaches in the kitchen is very unlikely to produce bites.

What does a cockroach bite look like?

A small red bump a few millimetres across, often with a scraped or scabbed centre because roaches chew rather than pierce. Usually single or a few, on the hands, feet, nails or around the mouth. It is sore more than itchy.

Do roach bites itch?

Some do. Most people feel soreness first; some react with itching and swelling like any insect bite. If you have many very itchy bites in lines or clusters, bed bugs or fleas are far more likely.

Can cockroaches crawl into your ears?

It happens; doctors report removing cockroaches from ear canals. Do not push a cotton swab or tweezers into the ear. Get medical help, especially if there is pain, bleeding or hearing loss.

Can a cockroach bite make you sick?

The bite is not venomous and does not transmit a known disease directly, but a bite that breaks the skin can become infected because roaches carry bacteria. Roach allergens in the home are a bigger health risk than the bites, especially for people with asthma.

Do baby cockroaches bite?

Nymphs have small mouthparts and very rarely break skin. Seeing many of them means roaches are breeding in your home, which is the situation where bites become possible.

The short version

Cockroaches can bite, but they rarely do, and when they do it means the infestation is severe. Look for a few sore, scraped bumps on fingers, nails, feet or lips, not lines of itchy welts. Wash the bite, keep it clean and watch for infection. Then deal with the roaches: identify the species from a photo with Bug Identifier, bait where they hide, and call a professional if you see them in daylight.