Why Only One of You Is Reacting
If you share a bed in Catford and only one of you has marks, read this before deciding it is not bedbugs.
A bedbug bite is not what you see in the morning. What you see is your body’s reaction to the saliva, and people vary enormously in how they react. Some come up in raised, itchy welts. Some get a faint mark that fades by lunchtime. Some show nothing at all, however often they are bitten.
So a partner with clear skin is not evidence that the bedbugs are choosing one of you. Both of you are very likely being fed on; only one of you is showing it. Reactions can also change over time, so the person who shows nothing now may start reacting later.

What Not to Conclude
- That it is an allergy, a rash or something in the washing powder, without first checking the bed
- That the person with the bites brought them in. Bedbugs arrive in luggage, furniture and visits, and there is no way of telling whose
- That the problem is in one side of the bed only. They move freely across a mattress
- That bites alone prove bedbugs. They do not; the evidence is in the bed, not on the skin
Our bedbugs or something else guide covers the other things that cause bites and marks overnight.
How to Check the Bed Together
- Strip the bed in daylight or with a strong torch, and bag the sheets straight into the machine for a hot wash.
- Run a finger along the mattress piping on both sides of the bed, looking for small dark spots, pale shed skins and tiny cream-coloured eggs.
- Lift the mattress and look at the base, the slats and the joints of the frame, especially the corners nearest the headboard.
- Check the headboard where it meets the wall, and the bedside furniture on both sides.
- Keep anything you find in a sealed bag or on clear tape. It lets us identify it on the phone or at an inspection.
If you cannot find anything but the bites carry on, a professional look is the next step. Inspections start at from £120 and confirm whether there is anything to treat before money is spent on a treatment.
Do Not Split Up Into Separate Rooms
The natural response is for the partner with the bites to move to the sofa or the spare room. It rarely helps the person, because bedbugs follow people and will find them again, and it often turns one infested room into two. The better plan is to stay put, check, and get it treated.
Once it is confirmed, the choice between heat and chemical is the same as in any bedroom, and is set out on the heat treatment page. For the wider picture across the borough, see the Lewisham page.
Looking After the Bites
Most reactions settle on their own once the biting stops. A pharmacist can suggest something for the itching, and a GP is the right person if the skin becomes infected or the reaction is unusually strong. Call 999 for any sign of a severe allergic reaction, such as swelling of the face or difficulty breathing.
Bedbug Control Catford — Questions
Can bedbugs prefer one person over another?
Both people in a bed are usually being bitten. The visible difference is almost always in how each person’s skin reacts, not in who is being fed on.
My partner has no bites at all. Could it still be bedbugs?
Yes. Some people never react. Look for the bugs, spotting and shed skins in the bed rather than relying on either of you to show marks.
Should the person with the bites sleep elsewhere?
No. Moving around usually carries bedbugs with you and spreads the problem. Stay in the bed until it has been treated.
Will the treatment be different because only one of us is bitten?
No. The whole bed and room are treated either way, because both sides of the bed are in play.
Is an inspection worth it before a treatment?
When you are not sure, yes. Inspections start at £120 and tell you whether there is anything to treat.
Elsewhere in Lewisham
The other areas in the borough, each written around a different situation.
Bedbug Advice for Catford
Picked for this page: the guides that go further on what matters for Catford.

Bedbugs, or Something Else?
A walkthrough you can do tonight with a torch, and what to do with what you find.
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Do Mattress Encasements Help?
What a zipped mattress cover can and cannot do, and when it earns its keep.
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Inspection First, or Straight to Treatment?
When the £120 saves you money, and when it is £120 you did not need to spend.
Read more →Bedbug Treatments in Lewisham
Every service has its own page for Lewisham: heat, chemical, hotels, commercial premises and inspections.
Covering Catford
Tell Us About the Property
Tell us what you have found in the bed, or that you have found nothing, and we will suggest the next step.