Identify
What do bed bug bites look like?
Bed bug bites are usually itchy red welts on skin that was uncovered while you slept. You do not feel the bite. Marks often show up hours later, sometimes days, and in some people not at all.
A line of three is a maybe, not a diagnosis. Look at one mattress seam tonight before you throw the bed out.
Key takeaways
- The bite is painless. Marks, if they come, show up later.
- Welts look a lot like mosquito or flea bites. Random or in a rough line.
- Some people never mark. Other people in the same bed may.
- CDC: confirmation is the insect, not the welt.
- Spreading rash, breathing trouble, or signs of infection are a clinician visit.
CDC: the insect injects an anesthetic, so you sleep through it. Marks, when they appear, look like a slightly swollen, itchy mosquito or flea bite. They may sit in a line or they may not. Some people show nothing. A few have a stronger allergic response.
Hours later, still not proof
CDC lists three skin outcomes: no marks, small bite marks, and rare serious allergic reactions. In some people the marks take as long as 14 days. Face, neck, arms, and hands are common because those stay uncovered. Covered skin can still get bitten if the sheet shifts.
A breakfast-lunch-dinner line is a pattern people talk about. Mosquitoes and fleas make lines too. CDC DPDx: the welt is not a specific diagnosis. Confirmation is an adult or a nymph collected where you sleep.
If a welt spreads, you have trouble breathing, or the skin looks infected, that is a clinician. This page cannot sort that out.
One seam tonight
Do not dump the mattress on a photo of an arm. EPA wants the insect: dark marker-like dots on the piping, tan skins, live bugs. Pull the sheet. Run a card along one seam. Photograph what you find.
Laundering the sheets is fine after the photo. Erasing the only evidence is not. Use the sighting log for the date and the room.
If the seam is clean and only the skin is loud, keep looking for a few mornings and still skip the curb. Used mattresses move infestations down the block.
Contact for a referral path. Typical US ranges live on bed bug treatment cost. This is not a diagnosis.