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You wake up with a row of itchy red bumps on your arm, and your mind goes straight to the worst possibility. Bed bugs? After a trip, or after hearing about bed bugs in the news, it's hard not to wonder.
I get it. I've talked with so many worried customers over the years that I understand that sinking feeling. So let's look at what bed bug bites actually look like, why bites alone can't tell you for sure, and what to do next.
What Bed Bug Bites Look Like
According to the CDC, bed bug bites look a lot like mosquito or flea bites. You'll usually see a slightly swollen red area that may itch or feel irritated. The marks can be scattered randomly or lined up in a straight row.
Bites often show up on skin that's exposed while you sleep. The CDC mentions the face, neck, arms, and hands, but any part of the body can be bitten.
Here's something many people don't expect. Bed bug bites affect everyone differently. The CDC says some people have no physical signs at all, some get small bite marks, and a few (rarely) have serious allergic reactions.
Why You Didn't Feel the Bite
When a bed bug feeds, it injects a tiny amount of fluid that includes an anesthetic (a numbing substance) and an anticoagulant (a substance that keeps blood from clotting). That's why you sleep right through it.
It's also why the marks can be slow to appear. The CDC says most people don't notice bites until one to several days later. In some people, it can take as long as 14 days. By the time you see a bite, you may not remember where you slept that night.
Why Bites Alone Can't Confirm Bed Bugs
This is the part I most want you to know. The EPA calls bites a poor indicator of a bed bug infestation. Bed bug bites can look like bites from mosquitoes or chiggers, like rashes such as eczema or a fungal infection, or even like hives.
Some itchy bumps in bed have nothing to do with bugs at all. For example, dust mites don't bite, but an allergy to them can make skin itchy and irritated.
So instead of studying the bites, look for physical signs of bed bugs. When you change the sheets, check the mattress seams, piping, and tags for:
- Rusty or reddish stains from crushed bed bugs.
- Tiny dark spots, which are bed bug droppings.
- Pale yellow shed skins or tiny white eggs.
- Live bugs about the size of an apple seed.
A sweet, musty odor in the room can be another clue. Not sure what you've found? Our guide, What Are Bed Bugs? How to Identify Them and Why They Spread, shows what to look for and where they hide.
How to Ease the Itch
The good news is that bed bug bites usually don't need medical treatment. The CDC suggests these steps:
- Apply an antiseptic cream or lotion to help with itching.
- Try not to scratch. Scratching can break the skin and lead to a secondary infection.
- For itchy, inflamed reactions, an antihistamine may help control the itching.
If you'd like to understand how antihistamines work, see Antihistamines, Decongestants & Nasal Steroids: How Allergy Medications Work. Check with your healthcare provider or pharmacist before starting any medicine.
When to Call a Healthcare Provider
An allergic reaction to bed bug bites is possible. The CDC says signs can include enlarged bite marks and painful swelling at the bite, and on rare occasions anaphylaxis (a severe, whole-body allergic reaction). Talk with your healthcare provider if bites are spreading, very swollen, painful, or look infected. For trouble breathing or other signs of a severe reaction, call 911.
It may also help to know that bed bugs are not known to spread disease to people, according to the CDC. The bites are miserable, but they aren't carrying an illness.
Found Signs of Bed Bugs? Here's Your Next Step
If you do find bed bugs, don't panic, and don't haul your mattress to the curb. You can usually save it. Our step-by-step guide, How to Get Rid of Bed Bugs in a Mattress, walks through the EPA's approach.
A sealed AllergyCare Stretch Knit (BedBug Solution Elite) mattress cover is a big part of that plan. It traps any bugs inside the mattress and makes it harder for them to reach you. It blocks dust mite allergens too, which I appreciate as someone who's allergic to dust mites.
Just back from a trip and worried? Our guide to preventing bed bugs at home and when you travel covers how to keep hitchhikers out of your suitcase.
Frequently Asked Questions
What do bed bug bites look like?
According to the CDC, bed bug bites look like mosquito or flea bites: a slightly swollen, red area that may itch. They may appear randomly or in a straight line. Some people have no visible marks at all.
How long does it take for bed bug bites to show up?
Most people don't notice bite marks until one to several days after the bite, and the CDC says in some people it can take as long as 14 days.
Can I tell bed bug bites apart from other bites?
Not reliably. The EPA says bed bug bites can look like mosquito or chigger bites, rashes such as eczema, or hives. Look for physical signs of bed bugs, such as rusty stains, dark spots, shed skins, or live bugs, to confirm.
How do you treat bed bug bites?
Most bites don't need medical treatment. The CDC suggests antiseptic creams or lotions for itching and avoiding scratching to prevent infection. An antihistamine may help with itchy reactions. See a healthcare provider if you think you're having an allergic reaction.
Do bed bug bites spread disease?
No. The CDC says bed bugs are not known to spread diseases to people. The main risks are itching, lost sleep, and skin infection from scratching.
Have questions about protecting your bed? Give us a call at (800) 771-2246. We've helped people with allergies since 1989, and we're happy to help you sleep easier.
Til next time,
Cheryl
Want the complete picture? This post is part of our free Practical Guide to Allergy-Free Living, built on allergy expertise we've been sharing since 1989 and covering dust mites, pet dander, air quality, laundry, and more.
Sources
- CDC, About Bed Bugs: https://www.cdc.gov/bed-bugs/about/index.html
- U.S. EPA, How to Find Bed Bugs: https://www.epa.gov/bedbugs/how-find-bed-bugs
Medical Disclaimer: The information on this page is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider — such as an allergist or your primary care physician — before making changes to your allergy management plan, starting new treatments, or if you have questions about a medical condition. In the event of a severe allergic reaction or anaphylaxis, call 911 or your local emergency number immediately and use an epinephrine auto-injector if one has been prescribed.