Insect Bite

Insect bites and stings can cause an immediate skin reaction. Most insect bites are minor and may cause the skin to swell and become red and itchy.

Itchy, red rash on the right side of the body and axilla from insect bites.

Bites from mosquitoes, fleas, and mites tend to cause itching, while stings from bees, wasps, and hornets are more likely to cause pain. Occasionally, bites or stings can lead to infection or a more serious allergic reaction, such as swelling of the face or throat, difficulty breathing, or dizziness. These situations may require urgent medical attention.

Symptoms

Mosquitoes
Mosquito bites usually cause small, round, raised bumps that are red, itchy, and sometimes swollen. The bumps can appear anywhere on the body, especially exposed areas like arms or legs. Mosquito bites are generally harmless in the UK and usually clear within a few days. However, in some parts of the world, mosquito bites can spread illnesses such as dengue or malaria — but this is not a risk within the UK unless travelling abroad.

Bedbugs
Bedbugs hide in bedding, mattresses, and furniture and typically bite at night. Their bites can appear as itchy red spots, often in a line or clustered pattern, usually on the arms, shoulders, or face. Scratching the bites can lead to broken skin, swelling, and potential infection. While unpleasant, bedbug bites are not dangerous and do not transmit disease.

Fleas
Flea bites are very small, red, and itchy. They usually appear in clusters or lines, often on the legs, ankles, or waist. Fleas can be found on pets and in carpets or soft furnishings. Some people may be more sensitive to flea bites and develop more intense reactions, including blisters or hives.

Bees, Wasps, Hornets
Stings from bees, wasps, and hornets usually cause a sharp pain followed by redness, swelling, and itching around the sting site. Bee stings typically leave a stinger behind, which should be carefully removed. Wasp and hornet stings may be more painful and can occur multiple times. Most stings improve in a few hours or days.

Fire Ants
Fire ants are not native to the UK and are not commonly encountered. Their stings, when they occur, cause painful, itchy blisters that may form pimples or pustules. In some cases, multiple stings can lead to more severe reactions.

Spiders
Spider bites are not common in the UK, and most UK spiders do not bite or pose any threat to humans. In rare instances where a bite occurs, it may cause mild symptoms such as redness, swelling, and pain similar to an insect sting. These symptoms usually settle within a few hours or days. Seek medical attention if the area becomes increasingly painful, swollen, or shows signs of infection.

Ticks
Tick bites are usually painless and may go unnoticed. A small red spot may appear at the bite site. Some ticks in the UK can carry Lyme disease, which may cause a circular rash (sometimes called a “bull’s-eye” rash), fatigue, fever, and joint or muscle pain. Ticks are most commonly found in grassy or wooded areas.

What can I do?

Self-care for mild bites or stings:

• Remove stinger (if present): Gently scrape off using the edge of a bank card or similar object. Avoid tweezers, as they may squeeze out more venom.

• Wash the area with soap and water to reduce the risk of infection.

• Apply a cold compress or ice pack (wrapped in a cloth) for at least 20 minutes to help reduce swelling and discomfort.

• Keep the area raised (if possible) to minimise swelling.

• Take paracetamol or ibuprofen for pain relief.

• Use oral antihistamines to relieve itching. Avoid antihistamine creams if the skin is broken or inflamed.

• Hydrocortisone cream (available at pharmacies) can help reduce redness and swelling.

Watch for signs of infection: Seek medical advice if you notice increasing redness, warmth, swelling, or pus.

Prevention Tips

• Use insect repellent on exposed skin and clothing.

• Wear long sleeves and trousers, especially in grassy or wooded areas.

• Avoid using strong scents, including perfumes and fragranced lotions, as they can attract insects.

• Cover food and drink outdoors. Insects may enter open soft drink containers.

• Keep windows and doors closed or use insect screens.

• Remove standing water to deter mosquitoes.

• Do not disturb or remove insect nests unless done by a professional.

Should I seek medical care?

Most insect bites and stings are not serious and get better within a few days. However, you should seek urgent medical attention if you or someone else experiences any of the following:

• Difficulty breathing, wheezing, or shortness of breath

• Swelling of the face, lips, mouth, throat, or tongue

• Tightness in the throat or difficulty swallowing

• Feeling faint, dizzy, or weak

• Pale or bluish skin (especially lips or face)

• Nausea, vomiting, or rapid heartbeat

These could be signs of a serious allergic reaction (anaphylaxis), which is a medical emergency. Call 999 immediately.

If you’ve previously had a serious allergic reaction to an insect sting or bite, carry an adrenaline auto-injector (e.g. EpiPen) and let those around you know how to use it in case of emergency.

Treatment

Minor insect bites can be treated with soap and water, and itchiness can be alleviated with topical antihistamines. If have severe allergies to insect bites or stings, you should have an emergency kit and EpiPen. Make sure your friends and family know how to use it if you have a reaction. Anti-venom medicine is available for black widow spider bites.