Waking up with itchy red marks is miserable. It is natural to blame bed bugs straight away, especially in a city where stories spread fast. However, marks on your skin cannot tell you what caused them.
This post explains why bites alone prove very little, what else can cause similar marks and how to look for evidence that does. It also covers when to speak to a pharmacist or GP.
Why bites alone cannot confirm bed bugs
The NHS page on bedbugs lists bites as one possible sign. It describes them as raised and itchy, often in a line or grouped together, on skin that is exposed while you sleep. It also tells you to look for other evidence, such as spots of blood on bedding and small brown spots on bedding or furniture.
The reason is simple. Many insects leave raised, itchy marks, and people react to bites in very different ways. Some people barely notice a bite, while others come up in large welts.
The NHS also notes that bites can look different on different skin tones. On light skin they are typically red or pink. On dark skin they may look brown, red or purple and can be harder to see. Therefore the colour of a mark is a weak clue.
Other common causes to consider
The NHS guide to insect bites and stings lists several culprits. It helps to keep them in mind before you decide.
- Fleas: often found in groups below the knees, and common where there are pets.
- Mites: these cause very itchy lumps.
- Mosquitoes: small, raised and itchy, more likely in warmer months.
- Midges and horseflies: horseflies leave larger, painful bites that may bleed.
Not every itchy rash comes from an insect. Allergies, eczema, hives and contact reactions to new detergent or fabric can look similar. In addition, dry winter air in a heated flat can irritate skin and cause itching.
If a pharmacist or GP thinks the cause is not an insect, you can avoid a treatment you do not need. That saves effort and stress. It also stops you blaming a clean home or a neighbour without cause.
Questions that help narrow it down
Ask yourself a few plain questions. They will not give you a diagnosis, but they point you towards the next step.
- Do the marks appear only after sleeping in one bed?
- Did they start after a trip, or after you brought home second-hand furniture?
- Does anyone else in the home have them?
- Do you have pets, or have you been outdoors in long grass?
- Did you start using a new soap, detergent or bedding?
Keep a short diary of when new marks appear and where you slept. Moreover, photograph the marks in daylight over several days. A GP or pharmacist can use these notes to judge what might be going on.
How to look for real evidence
Evidence in your home is far better proof than marks on your skin. Our step-by-step post on how to check a London flat for bed bugs walks you through the bed, headboard, sofa and skirting boards. Look for live insects, cast skins, dark spotting and eggs.
The NHS advises checking furniture, bed frames and mattresses. A torch and a plastic card help in tight seams. If you find an insect, photograph it and keep it in a sealed container.
Meanwhile, a clear check does not rule bed bugs out. They hide well, so repeat your inspection over a few weeks. Interceptor monitors under bed legs can also catch wanderers, and our after-treatment monitoring guide explains how monitoring works.
Caring for the bites
Whatever the cause, the same comfort steps usually help. The NHS suggests antihistamines or hydrocortisone cream for itching and paracetamol or ibuprofen for pain. It also suggests ice packs for swelling and avoiding scratching to prevent infection.
A pharmacist can talk you through what suits you. Ask them if you are pregnant, taking other medicines or treating a child. For children under 1 year old, the NHS says to see a GP.
What not to do
Avoid buying several sprays after one itchy night. Shop-bought products rarely solve a problem you have not yet confirmed. Furthermore, they can leave residues on bedding and make it harder to read the real signs.
Do not throw out your mattress in a hurry either. Without evidence, you may pay to replace something that was never the problem. In contrast, a calm check costs nothing and tells you far more.
Try not to scratch, even though it is hard. Broken skin can become infected, and an infected bite needs medical care. A cool cloth or an ice pack can take the edge off the itch while you investigate.
When to get medical help
See a pharmacist if a bite shows signs of infection, such as heat, redness, pus or fluid. See a GP if bites are still very painful, swollen or itchy after trying treatments, or if pain or swelling around them is spreading.
Call NHS 111 if symptoms get worse, or if you have dizziness or a high fever. Call 999 for signs of a serious allergic reaction, including sudden swelling of the lips, mouth, throat or tongue, or difficulty breathing. Do not wait to see if it settles.
If you do find bed bugs
Once you have real evidence, act in a calm order. Wash bedding hot, tell your landlord or managing agent in writing and read our urgent bed bug help guide. The NHS advises contacting your local council or pest control, since bed bugs can be hard to find.
Cost often worries people at this point. Our bed bug treatment cost guide explains what affects the price, and our post on how long treatment takes helps you plan. If you travel often, our routine for checking luggage after travel can stop a repeat.
Local guidance
Council pest services vary across London, so check your own borough’s current page. In the Square Mile, see the City of London area guide. In east London, read bed bug guidance for Tower Hamlets.
North London readers can use the Barnet area guide, and south east readers can use the bed bug advice for Bexley. Each page points to that borough’s own pest information.
Common questions
Can I confirm bed bugs from bites alone?
No. The NHS says to look for other signs, such as spots of blood on bedding or small brown spots on bedding and furniture. Bites look similar to those from other insects, so they cannot prove the cause.
What do bed bug bites look like?
The NHS describes them as raised and itchy, often in a line or grouped together. They can look red or pink on lighter skin and brown, red or purple on darker skin, where they may be harder to see.
When should I see a GP about bites?
See a GP if bites stay very painful, swollen or itchy after you have tried treatments. Also go if pain or swelling around a bite is spreading, because that can mean infection.
Who can help me ease the itching?
A pharmacist can advise on antihistamines or hydrocortisone cream for itching. Try not to scratch, since scratching can break the skin and cause infection.