Insect bite and stings
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Insect Bites UK: Symptoms, Treatment & When to Get Help
A complete guide to insect bites and stings — home treatment, signs of infection, allergic reactions, tick bites and when to seek help.
Concerned About a Bite or Sting?
Access Doctor GPhC-registered pharmacist independent prescribers can assess your symptoms online and advise on the most appropriate treatment or next step. No GP appointment needed.
Start Consultation →What Counts as an Insect Bite or Sting?
An insect bite or sting occurs when an insect or arachnid pierces the skin — either to feed (mosquitoes, fleas, bedbugs, midges, ticks) or to defend itself (bees, wasps, hornets). Saliva or venom introduced into the skin triggers a local immune and inflammatory response, producing the characteristic redness, swelling and itching.
Insect bites and stings are extremely common in the UK. Studies suggest that 56–94% of people are stung by a bee, wasp or ant at least once in their lifetime, and bites from mosquitoes, midges, fleas and other insects are even more widespread. Most bites and stings are not serious and settle on their own within a few days — but a minority become infected, trigger an allergic reaction, or transmit disease, and knowing the difference matters.
What Bit Me? Identifying Your Bite
The most reliable way to identify what bit you is not the insect itself — which you often never see — but the pattern, timing and location of the bite. Use the table below to narrow down the likely cause.
| What you notice | Likely cause | Typical detail |
|---|---|---|
| New bites you woke up with, not there before bed | Bedbugs | Often in a line or cluster on areas exposed during sleep (arms, shoulders, legs) |
| Multiple bites clustered at ankle/lower leg height | Fleas | Usually from pets; small itchy bumps, sometimes in short rows |
| Single bite, immediate sharp pain, sometimes a visible stinger | Bee sting | Stinger often left in the skin; scrape out, don’t squeeze |
| Single or repeated stings, no stinger left behind | Wasp or hornet sting | Can sting more than once; more common late summer/autumn |
| Small itchy bumps appearing within minutes outdoors, dawn or dusk | Mosquito | UK mosquitoes do not carry malaria |
| Intensely itchy bites on exposed skin, near water or in Scotland | Midge | Active in still, humid conditions |
| Bite was painless at the time; found an attached insect | Tick | May remain attached for days; watch for an expanding rash over the following weeks |
| Red ring expanding outward over days, sometimes “bullseye”-shaped | Possible Lyme disease (tick bite) | See your GP — not usually itchy or painful itself |
| Single, more painful bite than a typical insect bite | Spider (UK species) | UK spider bites are rarely dangerous; false widow is the main concern |
| Painful bite, slow to heal, sometimes after gardening or near livestock | Horsefly | Can be more prone to infection than other bites — monitor closely |
If you can’t identify the cause and the bite is behaving normally — gradually settling over a few days rather than getting worse — the specific insect rarely changes the treatment. Identification matters most when it changes what you watch for: a tick means watching for a rash over the following weeks; a bee sting means checking for a retained stinger.
Common UK Biting and Stinging Insects
| Insect | Bite/sting pattern | Key feature |
|---|---|---|
| Mosquitoes | Single or scattered small itchy bumps | More active at dawn/dusk; UK species do not carry malaria |
| Midges | Multiple small intensely itchy bites | Common in Scotland and near water |
| Fleas | Clusters of small bites, often in lines | Usually from pets; bites often at ankle height |
| Bedbugs | Bites in a line or cluster | Bites you wake up with that weren’t there before bed |
| Bees | Single sting; stinger often remains in skin | Most allergic reactions in the UK are from bee and wasp stings |
| Wasps and hornets | Single or repeated stings | More aggressive in late summer/autumn |
| Ticks | Often painless; may remain attached for days | Can transmit Lyme disease |
| Spiders (UK species) | Single bite | Rarely dangerous; false widow is the main concern |
Normal Symptoms and What to Expect
- A small, raised, red or swollen bump at the site
- Itching — often the most troublesome symptom
- Mild localised pain, particularly with stings
- Symptoms that usually peak within the first day or two and then gradually improve over several days
Important sign to watch for: Normal bites improve after the first 1–2 days. A bite that is getting worse rather than better after 48 hours is the main warning sign of infection or a developing allergic reaction.
Home Treatment: Step by Step
Clean
Wash the area with soap and water to remove debris and reduce infection risk.
Cool
Apply a cold compress for 10–20 minutes to reduce swelling and provide immediate relief.
Remove stinger
For bee stings: scrape out sideways with a fingernail or card — do not squeeze, which releases more venom.
Treat itching
Oral antihistamine and/or topical hydrocortisone cream to reduce histamine-driven itch and inflammation. Antihistamine cream (Anthisan) is another option for localised itch relief.
Treat pain
Paracetamol or ibuprofen as needed for discomfort.
Avoid scratching
Keep nails short; cover with a plaster if needed to reduce infection and scarring risk.
Monitor
Check daily for the first 2–3 days to catch any early signs of infection.
Concerned About a Bite or Sting?
Access Doctor GPhC-registered pharmacist independent prescribers can assess your symptoms online and advise on the right next step.
Start Consultation →NHS Pharmacy First for Infected Bites
If you think your bite has become infected, you don’t always need to book a GP appointment first. Under the NHS Pharmacy First service, participating community pharmacies can assess infected insect bites in those aged 1 year and over, and supply treatment — including antibiotics where clinically appropriate — without a GP referral.
- Search for a participating Pharmacy First pharmacy near you and book online or walk in
- The pharmacist will assess the bite and check your suitability and eligibility for the free NHS service
- Not every infected bite needs antibiotics — the pharmacist will advise on the most appropriate treatment
- If your symptoms suggest a more serious infection, you may be referred to your GP or an urgent care service for further assessment
Pharmacy First sits alongside the option of an online consultation with a prescriber such as Access Doctor — useful if you’d rather not visit in person, or if a local appointment isn’t available quickly.
Signs of Infection
An insect bite may have become infected if you notice, typically from day 2–3 onwards:
- Increasing pain, redness or swelling spreading beyond the original bite
- Warmth around the affected area
- Pus or yellow/cloudy discharge
- Red streaking extending away from the bite
- Swollen, tender lymph nodes near the bite
- Fever or feeling generally unwell
Infected bites are typically treated with topical or oral antibiotics, and assessment by a prescriber or GP is recommended before starting treatment.
- Mild, localised infection: a topical antibiotic such as Fucidin cream may be sufficient
- More extensive or spreading infection: an oral antibiotic such as flucloxacillin is commonly used as first-line treatment
- Penicillin allergy: clarithromycin is a suitable alternative for those who cannot take penicillin-based antibiotics
Which option is appropriate depends on the severity and extent of the infection, your medical history, and any allergies — a prescriber assessment will determine the right choice for you.
Allergic Reactions and Anaphylaxis
Most allergic reactions to insect bites or stings in the UK are caused by bee and wasp stings. Reactions range from mild and local to severe and life-threatening:
| Reaction type | Features | Action |
|---|---|---|
| Normal local reaction | Redness and swelling limited to the site, <5cm | Home treatment |
| Large local reaction | Swelling extending beyond the immediate site | Antihistamine; seek advice if severe |
| Anaphylaxis | Facial/throat swelling, breathing difficulty, collapse | Call 999 immediately |
Anaphylaxis is a medical emergency. If someone develops swelling of the face, lips, tongue or throat, difficulty breathing or swallowing, widespread hives, or sudden dizziness or collapse after a bite or sting, call 999 immediately. If they carry an adrenaline auto-injector, use it without delay.
Tick Bites and Lyme Disease
Tick bites are often painless and may go unnoticed, particularly after walking through grass, woodland, or moorland. The main concern with tick bites in the UK is Lyme disease, a bacterial infection transmitted by infected ticks.
- Removing a tick: use fine-tipped tweezers, grasp close to the skin, and pull upward steadily without twisting
- Watch for erythema migrans — a red mark that expands outward over days, sometimes forming a bullseye pattern, typically appearing 3–30 days after the bite
- Other Lyme disease symptoms include fever, fatigue, headache, and joint pain
- Lyme disease is treated with a course of antibiotics — earlier treatment improves outcomes
Travel and Tropical Disease Risk
In certain regions outside the UK, mosquito bites can transmit diseases not found domestically, including malaria, dengue fever, and Zika virus.
- Take prescribed antimalarial medication exactly as directed if travelling to a malaria-risk area
- Use insect repellent and bite-avoidance measures
- If you develop fever within weeks to months of returning, seek urgent medical assessment and mention your travel history
Prevention
- Use insect repellent on exposed skin, particularly at dawn and dusk
- Wear long sleeves and trousers in grassy or wooded areas
- Check for ticks after walking in grass, woodland or moorland
- Keep windows screened or closed at dusk in mosquito-prone areas
- Treat pets regularly for fleas
When to Seek Medical Help
Call 999 / go to A&E for facial or throat swelling, difficulty breathing, or widespread hives with dizziness or collapse.
- Signs of infection (spreading redness, pus, fever)
- An expanding rash — particularly a bullseye pattern — after a tick bite
- A large local allergic reaction not settling with antihistamines
- Bites affecting the eye or inside the mouth
- Fever after returning from a malaria-risk region
Frequently Asked Questions
How do I know if my insect bite is infected?
Watch for increasing pain, redness or swelling spreading after 48 hours, warmth, pus, red streaking, swollen lymph nodes, or fever. Worsening rather than improving is the key warning sign.
What is the best treatment for an itchy insect bite?
An oral antihistamine plus a topical hydrocortisone or antihistamine cream reduces itching and inflammation. A cold compress gives immediate relief. Avoid scratching to reduce infection risk.
When should I see a doctor about an insect bite?
Seek assessment for signs of infection, a bullseye rash after a tick bite, bites affecting the eye or mouth, or any sign of allergic reaction. Facial/throat swelling is a 999 emergency.
What does a tick bite rash look like and what should I do?
Erythema migrans is a red mark expanding outward over days, sometimes forming a bullseye pattern. Appears 3-30 days after a tick bite. See your GP — Lyme disease is treated with antibiotics.
Can insect bites cause a serious allergic reaction?
Yes — most commonly from bee and wasp stings. Anaphylaxis (facial/throat swelling, breathing difficulty, collapse) is rare but life-threatening and needs immediate 999 care.
Are insect bites dangerous when travelling abroad?
In malaria-risk regions, mosquitoes can transmit malaria, dengue and Zika. Take prescribed antimalarials and use repellent. Seek urgent care for fever after returning.
Why do some people get bitten more than others?
Biting insects are attracted by body heat, exhaled CO2, skin bacteria and body odour. Genetics, blood type and pregnancy can all influence how attractive someone is to insects.
Can I get treatment for an infected insect bite without a GP appointment?
Yes. The NHS Pharmacy First service lets participating pharmacies assess and treat infected insect bites in those aged 1 and over, including supplying antibiotics where appropriate, without needing a GP referral. Online prescribers such as Access Doctor are also an option.
References
- NICE Clinical Knowledge Summaries. Insect bites and stings. Updated 2023. cks.nice.org.uk/topics/insect-bites-stings
- NHS. Insect bites and stings. nhs.uk/conditions/insect-bites-and-stings
- UK Health Security Agency. Lyme disease: guidance, data and analysis. gov.uk/guidance/lyme-disease-epidemiology
- NHS England. NHS Pharmacy First Service. nhs.uk/nhs-services/pharmacies/pharmacy-first
Medical disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. In an emergency call 999.
