How to identify a Bed bug

Cimex lectularius
· Also called bedbug, cimex, hotel bug, what do bed bug bites look like, bed bug vs flea vs mosquito, bedbug identification

Bed bug vs flea vs mosquito: pattern and place beat the look of a single welt. Bed bugs feed on the torso at night in a line or cluster.

Someone searching this page usually has a bed bug in a photo, on skin, or in a story about beds, hotels, furniture. Use the marks, the bite, and the range together. Bed bug vs flea vs mosquito: pattern and place beat the look of a single welt. Bed bugs feed on the torso at night in a line or cluster.

What does a bed bug look like?

Flat, oval, rusty-brown, no wings, apple-seed size. Hides in mattress seams. Blood spots on sheets; musty smell in heavy infestations.

Bed bug (Cimex lectularius) is Adult about 5–7 mm, apple-seed shape. Colors people notice: brown, red, tan. Field marks: Flat, oval, rusty-brown, no wings; Hides in mattress seams by day; Sweetish or musty room smell in heavy infestations; Blood spots on sheets. It is found indoor. If those marks are missing, open Cat flea, Bat bug, Northern house mosquito before you force this name. Search phrases that belong on this page include what a bed bug looks like and bed bug identification.

Identification marks

Flat, oval, rusty-brown, no wings
Hides in mattress seams by day
Sweetish or musty room smell in heavy infestations
Blood spots on sheets

Size: Adult about 5–7 mm, apple-seed shape
Colors: brown, red, tan
Where: indoor

What a typical bed bug bite looks like

Typical bed bug bite or sting — A typical pattern. Reactions vary. This is a guide photo, not a diagnosis.

Itchy red welts in a line or cluster (“breakfast, lunch, dinner”) on skin that was against the mattress — arms, shoulders, back. Not everyone reacts. Fleas: ankles and a pet. Mosquitoes: scattered, often outdoor or window.

People searching “bed bug bite identification” want the pattern, not a single anonymous bump. Itchy red welts in a line or cluster (“breakfast, lunch, dinner”) on skin that was against the mattress — arms, shoulders, back. Not everyone reacts. Immediate steps on this page: Inspect mattress seams with a flashlight; Do not apply farm pesticides to beds; Call a professional; wash and heat-dry linens; Soothe itch; bites themselves are not a disease emergency for most people; If you traveled, inspect luggage. This species does bite or sting people. Fever, spreading redness, trouble breathing, or a child with many stings is professional care.

If you were bitten

Inspect mattress seams with a flashlight
Do not apply farm pesticides to beds
Call a professional; wash and heat-dry linens
Soothe itch; bites themselves are not a disease emergency for most people
If you traveled, inspect luggage

Bed bug vs Cat flea

Bed bug vs flea vs mosquito is pattern and place. Bed bugs: line or cluster on skin that was against the mattress, noticed after sleep, rusty spots on sheets. Fleas: ankles, jumping, pet. Mosquitoes: scattered, often outdoor or a window, you sometimes hear them. Bat bugs look identical; attic bats change the treatment.

Cat flea identification (Ctenocephalides felis)
Bat bug identification (Cimex pilosellus)
Northern house mosquito identification (Culex pipiens)
Chigger identification (Eutrombicula alfreddugesi)
Scabies mite identification (Sarcoptes scabiei)
Straw itch mite identification (Pyemotes tritici)
Kissing bug identification (Triatoma sanguisuga)
Western conenose identification (Triatoma protracta)
Varied carpet beetle identification (Anthrenus verbasci)
Lady beetle identification (Harmonia axyridis)
German cockroach identification (Blattella germanica)

Range and season

Every state and province. Year-round. Travel and used furniture.

Hotels, apartments, used furniture, every state and province, year-round.

Worldwide, including every U.S. state and Canadian province. Travel and used furniture spread them.

Year-round

Common questions

What do bed bug bites look like?

Often a row or patch of itchy red welts on one side of the body that was against the bed. Appearance varies a lot by person.

Do they transmit disease?

They are not important disease vectors in North America. The harm is itch, sleep, and infestation.

Bed bug vs flea?

Fleas usually bite ankles and jump. Bed bugs feed on the torso at night and do not jump.

Bed bug vs mosquito bites?

Mosquitoes: scattered outdoor or window welts. Bed bugs: a line or patch on the side of the body that was against the bed, noticed after sleep.

Bed bug vs flea bites?

Fleas: ankles and lower legs, pet in the house. Bed bugs: sleeping skin, mattress clues.

Do bed bugs live in clean homes?

Yes. They hitchhike. Cleanliness is not the main risk factor.

Bed bug identification (Cimex lectularius)