What do bed bug bites look like?

Small red, raised bumps or welts, often with a darker red center, usually in a line or tight cluster of three or more. In sensitive people they can swell into larger hive-like patches or, rarely, blisters.

Do bed bug bites itch?

For most people, yes — often intensely, and the itch can get worse over the first few days. Some people never react at all.

What do fresh bed bug bites look like?

Fresh bites are often flat or slightly raised pink spots that become red, puffy and itchy over the next hours or days. Because reactions can be delayed, the bites you see may be from a night or more earlier.

I have bites but no signs of bed bugs. What else could it be?

Fleas, mosquitoes, chiggers, mites from rodents or bird nests, spiders, or a non-insect cause like hives or eczema. Put interceptor cups under the bed legs and inspect seams; if nothing turns up and the marks continue, see a doctor or dermatologist.

What do bed bug bites look like on a baby?

Similar to adults — red bumps, sometimes in lines — often on the face, neck and arms. Babies can react more strongly. Keep their nails short, and talk to your pediatrician before using any cream or medicine.

Can you feel a bed bug bite?

Usually not. Bed bug saliva contains an anesthetic, and feeding happens while you sleep, typically in the early morning hours.

Bed Bug Bites: What They Look Like and How Long They Last

Bed bug bites are small, red, itchy welts — often with a darker center — that typically appear in a line or tight cluster on skin that was exposed while you slept. They usually fade in one to two weeks, but they can't be diagnosed by looks alone: about a third of people don't react at all, and other bites look similar.

What a photo can't tell you is the context — timing, location on the body, who in the household gets bitten, and what's in the bed. That's where the real answer is.

What bed bug bites look like

Row of four bed bug bites on a forearm — The classic pattern: a bug feeds, moves a step, feeds again.

Shape: raised red bumps or flat red spots, 2 to 5 mm across; in sensitive people, larger swollen welts like hives. A tiny dark red dot at the center is common.
Pattern: the giveaway is a line of three to five bites or a tight cluster. A bug probes, moves an inch, and feeds again — or several bugs feed side by side along the edge of a sheet or pajama sleeve.
Location: arms, hands, shoulders, neck, face, and legs — wherever skin touched the mattress or was uncovered. Unlike flea bites, they're not concentrated on the ankles.
Itch: often intense and worse at night. Scratched bites crust over, darken and can leave marks for weeks.

Bed bug bites close up and over time

Bed bug bites over time: fresh, on day three, and scratched with a scab — Fresh bites are pink and puffy; by day 3 they're often darker and itchier; scratched bites crust over.

Reactions are frequently delayed. Some people get welts within hours; others not for days, and people bitten for the first time may not react for a week or more. That's why "fresh" bites can confuse — they're often from a night or two earlier.

Over about a week a typical bite goes from a pink bump to a darker, flatter red spot, then fades. Repeated bites over weeks can make the reaction stronger.

How long do bed bug bites last?

Most fade within 1 to 2 weeks if you don't scratch them. Bites that keep getting scratched, or new bites on top of old ones, can make it feel like a rash that never ends. If you keep getting new bites, the infestation is ongoing — the bites won't stop until the bugs do.

Bed bug bites or something else?

Bites look alike more than people think. Use the pattern, timing and location:

Clue	Bed bugs	Fleas	Mosquitoes	Chiggers
Where on body	Arms, neck, face, shoulders, legs	Ankles and lower legs	Any exposed skin	Sock line, waistband, behind knees
Pattern	Lines or clusters	Small scattered groups	Random, single	Clusters where clothing is tight
When noticed	On waking	Any time, often after pets or yard	Evening/outdoors	1–2 days after yard or woods
Bump	Flat-to-raised welt, dark center	Tiny red dot with halo	Puffy pale welt, fades fast	Intensely itchy red bump

Detailed comparisons: bed bug vs. flea bites and bed bug vs. mosquito bites. For everything else, see our bites hub.

Bites but no signs of bed bugs

This is one of the most common situations. Before you treat your home:

Inspect the mattress, box spring and bed frame properly, following our signs of bed bugs guide.
Put interceptor cups under each bed leg for 1–2 weeks.
Think about pets (fleas), recent yard work (chiggers), rodents or birds in the attic (mites), and new detergents or medications (skin reactions).
If you find nothing and new marks keep appearing, see a doctor or dermatologist. Many skin conditions look like bug bites.

Who gets bitten

Bed bugs feed on anyone sleeping in or near the infested bed. It often looks like only one person gets bitten — that's usually because the other person doesn't react visibly, not because they're spared. Kids and babies are bitten too; their bites often show on the face, neck and arms.

Bed bug bites on babies and children

Children are bitten the same way adults are, but because their skin is thinner and they're more likely to scratch, bites can look more dramatic — larger swollen welts, often on the face, neck, arms and hands. Check the crib or child's bed the same way you would an adult bed: mattress seams, corners, the crib frame joints and any bumper or padding. Keep nails short, dress them in light long sleeves at night during treatment, and ask your pediatrician before using any cream or medicine. A child with eye swelling, widespread hives, fever or a bite that looks infected should be seen promptly.

Do bed bug bites spread disease?

The CDC notes that bed bugs have not been shown to transmit disease. The risks are itching, skin infection from scratching, occasional strong allergic reactions, and sleep loss.

First aid for bed bug bites

Wash the bites with soap and water.
Don't scratch. Keep nails short, especially on children.
A cold compress can calm itching and swelling.
Over-the-counter anti-itch options (such as hydrocortisone cream, calamine, or an oral antihistamine) are commonly used; follow the package directions and check with a pharmacist or pediatrician for children.

See a doctor if bites become hot, painful, increasingly swollen or ooze pus; you develop a fever; you get blisters or large swollen areas; or you have any trouble breathing or facial swelling (call 911).

Stop the bites: deal with the source

Treating bites only treats symptoms. If you've confirmed bed bugs, follow the plan on how to get rid of bed bugs. While you do, isolate your bed — encasements, interceptors, bed pulled off the wall — so you can sleep with fewer bites. Learn more about the insect itself on our bed bugs page.

Bed Bug Bites: What They Look Like, Pictures, How Long They Last