Bed Bug Bites vs Other Insect Bites

Start With the Conclusion

Bites cannot tell you what bit you. Not reliably, not from a photograph, and not from a pattern. Everything below is a tendency rather than a rule, and the exceptions are common enough that acting on the appearance of a bite is how households end up treating the wrong insect for months.

Anything about your skin — a reaction that concerns you, something that is not settling, anything infected — is a question for a pharmacist or a GP rather than a pest controller. What we can tell you is what is in the room.

The Tendencies, For What They Are Worth

• Bed bugs: more often on skin exposed while asleep — arms, shoulders, neck, upper back. Sometimes in a rough line or cluster, which is often described as diagnostic and is not
• Fleas: more often around ankles and lower legs, because the insect is coming off a floor. Usually a pet somewhere in the picture
• Mosquitoes and midges: anywhere exposed, indoors and out, seasonal, and generally isolated rather than grouped
• Harvest mites: around waistbands, sock lines and anywhere clothing is tight. Late summer, and usually after being in long grass

Every one of those has a large overlap with the others, and each of them varies more between people than it does between species.

Why Reaction Varies So Much

This is the part that undoes the whole exercise. Reaction to a bed bug bite differs enormously from person to person: some people react within hours, some take days, and a significant proportion show no visible reaction at all.

• Two people in the same bed can be bitten equally and only one shows anything
• The same person's reaction can change over time with repeated exposure
• A delay of several days between the bite and the mark makes working backwards unreliable
• Things that are not bites at all — hives, contact reactions, several skin conditions — can look similar

What To Do Instead

Use the bites for what they are actually good for: a prompt to go and look. Then settle it with physical evidence, which does not vary between people.

1. Strip the bed and check the mattress piping at the head end, both faces
2. Look for dark spotting that smears on a damp white cloth
3. Look for pale, papery cast skins in the seams and frame joints
4. Look for millimetre eggs cemented into a seam
5. Check the frame joints and behind the headboard
6. If there is a pet, check its bedding and its coat for flea dirt too

Sandhurst: Getting a Straight Answer

If the bites continue and you can find nothing at all, that is worth taking seriously rather than looking harder at the same bed. It usually means one of three things: it is very new and there is genuinely almost nothing to find, you are looking at the wrong bed in the property, or it is not an insect at all.

Say that when you call. Identification is part of the job, and a household that has spent three months treating a carpet for the wrong thing is a much more common story than it should be.