Bites from flying insects —such as mosquitoes, wasps, bees, and horseflies—can cause local reactions ranging from mild irritation to severe allergic reactions. Identifying the insect responsible helps in choosing the appropriate treatment and recognizing signs that require urgent medical attention.
What is a flying insect bite?
An insect bite is a localized skin lesion caused by the injection of saliva (mosquitoes, horseflies) or venom (wasps, bees). The local reaction—redness, swelling, warmth, and itching—results from the release of histamine. It is generally mild but can become severe in people with allergies.
How can you identify the bite based on the insect?
The location and appearance of the reaction provide clues as to the insect responsible.
- Mosquito: small, pink, centered papule; intense itching; moderate swelling—multiple bites on exposed areas
- Wasp or bee: immediate, sharp pain, more significant swelling, warm redness—visible stinger in the case of a bee (remove without squeezing)
- Horsefly: painful bite, larger erythematous area, sometimes pinpoint bleeding
- Midge: small, very itchy lesion that may leave a small scab
How do you treat an insect bite?
Immediate first aid limits the local reaction and prevents infection.
- Wash the area with soap and water, then disinfect it with an antiseptic solution
- Apply a cold compress: reduces swelling and soothes pain (10 to 15 minutes)
- For a bee sting: Remove the stinger by scraping it with your fingernail or a stiff card, without pinching
- Do not scratch: this can lead to a bacterial infection and spread of the injury
What products can relieve stings?
Drugstores offer specific topical treatments available without a prescription.
- Soothing anti-sting gels: contain anti-itch and local decongestant ingredients; apply as soon as symptoms appear
- Topical antihistamine creams: reduce itching and redness
- Heat pen: brief localized heat (45 °C, 3–5 seconds) that denatures the proteins in the venom—use immediately after a sting
- Topical corticosteroids: use only as directed by a doctor for widespread local reactions
When should you seek medical attention after an insect bite?
Most bites heal without treatment within 24 to 72 hours. Certain signs require immediate medical attention or an emergency visit.
- A local reaction extending beyond the bite site that persists for more than 48 hours
- Sting in the mouth or throat: risk of airway swelling
- Signs of anaphylaxis: generalized hives, difficulty swallowing or breathing, dizziness, drop in blood pressure— call 15 or 112 immediately
- Known history of insect venom allergy: use the epinephrine auto-injector (Anapen®) if prescribed, then call 15
How can you avoid being stung by flying insects?
Prevention involves a combination of repellents, barriers, and appropriate behavior.
- Topicalmosquito repellents: DEET, icaridin, or lemon eucalyptus, depending on your destination
- Light-colored, loose-fitting clothing, preferably with long sleeves
- Avoid peak mosquito activity times (dusk and dawn)
- Stay calm around wasps: sudden movements can provoke an attack
- In wooded areas: apply repellent to skin and clothing; checkfor ticks after every outing
