- They can appear hours or even days after the bite, so timing is a weak clue.
- Some people never react, so no bites does not mean no bed bugs.
- The only proof is finding signs of the bugs themselves.
Waking up covered in itchy marks is horrible, and it is natural to assume bed bugs. But several other things leave very similar marks, and each one needs a completely different fix. Spending money on the wrong solution is the most common mistake we see. Use the quiz below, then confirm with the physical signs.
What is biting me? Free 5 question quiz
1. What do the marks look like?
2. Where are they mostly?
3. When do you notice them?
4. Anything else going on?
5. Have you checked the mattress seams?
Bed bug bites compared with other itchy marks
| Cause | What it looks like | Where | Best next step |
|---|---|---|---|
| Bed bugs | Raised red bumps in lines or clusters | Arms, neck, face, back | Check mattress seams; 8 step plan |
| Fleas | Small dots with a red centre, in groups | Ankles, lower legs | Treat pets and home for fleas |
| Mosquitoes | Single puffy bumps that appear fast | Any uncovered skin | Screens, repellent |
| Dust mite allergy | No bites. Itchy rash, eczema flares, often with sneezing | Where skin meets bedding | Seal bedding against mites; dust mite protector set |
| Carpet beetle larvae | Itchy rash from their hairs, not bites | Neck, arms, legs | Find and remove larvae |
| Scabies | Tiny burrow lines and spots, intense night itch | Fingers, wrists, waist | See a pharmacist or GP; it needs treatment |
What do bed bug bites look like on different skin tones?
On lighter skin, bed bug bites usually look pink or red. On brown and black skin they can look purple, dark brown or barely raised, and the redness can be hard to see, so the itch, the pattern (lines and clusters) and the location matter more than colour. Post-inflammatory dark marks can last for weeks after the itch has gone.
How to treat bed bug bites
- Wash the bites with soap and water.
- Use a cool, damp cloth to ease swelling and itching.
- Try not to scratch; keep nails short.
- A pharmacist can recommend an antihistamine or a mild steroid cream for itching.
Bites on a child? See our calm, child-safe plan for bed bugs in a child's bed or cot.
Stop the bites at the source
Creams treat the itch, not the cause. If you have found signs of bed bugs, the fastest way to stop being bitten in bed is to remove their hiding places in it: hot wash the bedding and seal the mattress in a full-zip encasement so bugs inside cannot reach you.
Frequently asked questions
How long do bed bug bites take to appear?
Anywhere from a few hours to several days. That delay is why people often blame the wrong place or the wrong night.
Do bed bug bites spread disease?
They are not known to spread disease in the UK. The main risks are itching, broken sleep and infection from scratching.
Why is only one person in my bed getting bitten?
Usually both are bitten, but only one reacts. Reactions vary a lot from person to person, and some people show little or no reaction at all.
Can dust mites bite?
No. Dust mites do not bite. Their droppings trigger allergies that can cause itchy skin, eczema flares and a blocked nose, which is often mistaken for bites.
Bitten in bed? Seal it tonight
Full-zip, six-sided encasement. Bugs inside cannot reach you, and new ones cannot move in. Free next-day UK delivery on orders over £149.
Shop the bed bug encasement Check for signs firstWritten by Richard Williams, founder of iDustMite, former NHS worker, guest speaker at the Allergy UK Show in 2025 and 2026, and adviser on over 1,000 one-to-one bedroom consultations. This is general information, not medical advice. Reviewed October 2026.
