Module 2 of 7 · about 5 minutes
What bed bug bites look like, how to support a worried resident or guest, and when to point them to medical advice.
Reviewed by the ThermoPest technical team · Last reviewed October 2026
Bed bug bites are usually itchy, raised spots, often in a line or cluster on skin exposed during sleep, such as the face, neck and arms. They usually settle on their own within a week or so. Staff shouldn't diagnose bites: describe what the person tells you, point them to a pharmacist or GP if needed, and look for other signs of bed bugs.
According to the NHS, bites are raised and itchy and often appear in a line or grouped together. On white skin they usually look red or pink; on black or brown skin they may look brown, red or purple and be harder to see. People react differently: some barely notice bites, so one person in a household or room may have obvious bites while another seems to have none.
Bites from fleas, mosquitoes and other insects can look very similar, and skin conditions such as hives can too. Bites tell you something may be wrong; the signs in Module 1 tell you whether it’s bed bugs.
NHS guidance is that a pharmacist can advise on creams and antihistamines for itchy bites. People should see a GP if bites are still very painful, swollen or itchy after pharmacy treatment, or if pain or swelling around the bites is spreading, as there may be an infection. If symptoms get worse, they can ask for an urgent GP appointment or use NHS 111. Call 999 for signs of a severe allergic reaction, such as a swollen mouth or throat or difficulty breathing.
Where to point someone for help
Based on NHS guidance. Point people to the right help; don't recommend specific medicines.
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