Bumps after sleeping: dust mites, bed bugs or something else?
In this article
Dust mites don't bite, so they don't cause individual bumps or bites. If you wake up with itchy bumps, the most common causes are bed bugs (3 to 5 bites in a row), fleas (clusters on the ankles and lower legs), mosquitoes (separate bumps on uncovered skin) or scabies (itching between the fingers and on the wrists, worse at night). A dust mite allergy tends to cause dry, itchy patches without a bite pattern.
Can dust mites bite?
No. Dust mites don't drink blood and cannot bite through your skin. They live on skin flakes in your mattress, pillow and duvet. Symptoms only occur in people who are allergic to the allergen in their droppings, and that causes sneezing, a blocked nose or itchy patches rather than bites. Read more in dust mite bite? What really happens.
Quick check: what pattern do you see?
The pattern and location of the bumps often say more than the bumps themselves. Use this table as a first guide.
| What do you see? | Think of | Next step |
|---|---|---|
| 3 to 5 bumps in a row or close together, on the arms, legs, back or neck | Bed bugs | Check mattress seams and bed frame |
| Small clusters of bumps on the ankles and lower legs | Fleas | Check your pet and rugs |
| Separate, raised bumps on skin that was uncovered | Mosquitoes | Insect screens, and listen for buzzing in the bedroom |
| Itching between the fingers, on the wrists or in the groin, especially at night | Scabies | Call your GP, as it is contagious |
| Small red itchy bumps in spring or summer, sometimes with tiny bugs near a window or wall | Bird mites | Look for an abandoned bird's nest near the house |
| Dry, red, itchy patches without bites, worse in the morning and in autumn | Dust mite allergy | See your GP for an allergy test |
Which bug is causing my bumps?
Below are the features that help you tell each cause apart.
Bed bugs
- Pattern
- Often 3 to 5 bites in a row or a small cluster, sometimes called "breakfast, lunch and dinner".
- Location
- Skin that touches the mattress at night or is uncovered: arms, legs, torso, neck.
- Other signs
- Small blood spots on the sheet, black specks in mattress seams. Not everyone reacts: your partner may notice nothing at all.
Fleas
- Pattern
- Small groups of two or three bumps, often with a red dot in the middle.
- Location
- Mainly the ankles and lower legs, because fleas live in carpets and pet beds.
- Other signs
- A pet that scratches. Also possible without a pet of your own, via neighbours or previous occupants.
Mosquitoes
- Pattern
- Separate, raised bumps without a fixed pattern, sometimes pale with a red border.
- Location
- Skin that was above the duvet: face, hands, arms.
- Other signs
- Mainly in warm months. A mosquito bite usually fades faster than a bed bug bite.
Scabies
- Pattern
- No bites: the scabies mite burrows tunnels in the skin. You see red, wavy lines, bumps or blisters.
- Location
- Between the fingers, on the wrists, sometimes between the toes, in the armpits, groin or genital area.
- Other signs
- Intense itching, especially at night or when warm. People you live with often get symptoms too.
Bird mites
- Pattern
- Small, red, itchy bumps, scattered or in groups.
- Location
- Often the arms, neck and upper body.
- Other signs
- Usually in spring and summer, when young birds have left a nest under the roof or near a window and the mites crawl indoors.
Dust mite allergy
- Pattern
- No bites, but dry, red, itchy patches or flaring eczema. Sometimes hives.
- Location
- Varies, often the face, neck and areas with eczema.
- Other signs
- Sneezing or a blocked nose at the same time, worse in the morning and in autumn. Read more in dust mite rash.
How do you recognise bed bug bites?
You can recognise bed bug bites by red, itchy bumps that are close together or in a row, on areas that touch the mattress while you sleep. They look a bit like pimples and stay visible longer than a mosquito bite. Because the bites can take hours to appear, the moment you discover them says little.
Check with a torch:
- the seams, edges and labels of your mattress;
- cracks and screw holes in the bed frame and headboard;
- behind skirting boards, pictures and loose wallpaper near the bed.
Bed bugs are a nuisance but don't transmit diseases. Don't spray insecticide yourself; that often drives them deeper into hiding. Call in a pest control company.
What is the difference between scabies and dust mite bumps?
Scabies is a skin infection caused by a mite that lives in your skin, causes intense night-time itching in typical places such as between the fingers, and spreads through prolonged skin contact. Dust mites don't live on your skin, aren't contagious and only cause symptoms if you have an allergy. Scabies has nothing to do with hygiene and needs to be treated by your GP, often for the whole household at the same time.
What should you do if you wake up with bumps?
- Take photos and note the patternWhere are the bumps, how many, in a row or scattered, and when did you notice them? This helps you and your GP.
- Check your bedUse a torch to look in mattress seams and the bed frame for bugs, black specks or blood spots.
- Look beyond the bedIs your pet itchy? Is there a bird's nest under the gutter or near the window? Do people you live with have symptoms too?
- Wash bedding at 60 °CThis helps against fleas and dust mites and is a good first step with bed bugs, but it won't solve a bed bug infestation on its own.
- Get the right helpA pest control company for bed bugs, your GP if you suspect scabies or an allergy.
- you have itching between your fingers, on your wrists or in your groin that is worse at night;
- the bumps become infected: warm, painful, with pus or a red streak;
- you develop a fever or feel unwell;
- symptoms don't improve after two weeks and you can't find the cause.
Frequently asked questions about bumps after sleeping
Can dust mites cause bumps?
Not through bites, because dust mites don't bite. With a dust mite allergy you can get itchy red patches, flaring eczema or hives. These look like a rash, not like separate bites with a dot.
Are bumps in a row always bed bugs?
Not always, but it is the clearest sign. Other insects can also bite several times close together. If you find bugs, black specks or blood spots in mattress seams or the bed frame, bed bugs are very likely.
Why does my partner have no bumps while I do?
Not everyone reacts equally strongly to bites. With bed bugs, fleas and mosquitoes, one person can get lots of itchy bumps while the other notices nothing, even though you are both being bitten.
Are bumps from bed dangerous?
Usually not. Bed bugs, fleas and mosquitoes in the Netherlands and Belgium are mainly a nuisance. The risk lies in scratching, which can lead to skin infections. Scabies is not dangerous, but it is contagious and needs treatment.
Does vacuuming help against bumps?
It depends on the cause. Thorough vacuuming of floors and pet beds helps against fleas, together with treating your pet. For bed bugs, vacuuming alone is not enough. With a dust mite allergy, cleaning your mattress and sofa reduces the allergen, as explained in is a regular vacuum cleaner enough against dust mites?
Sources (in Dutch)
This article is for general information and does not replace advice from your GP.