Horsefly Bites: How To Tell If You've Been Bitten & Treatments

Horseflies are a robust species of fly belonging to the Tabanidae family. Found in large numbers in the countryside near livestock, the bloodsucking insects are known for their size and biting behaviour.

Jump to:

• What does a horsefly bite look like?
• How do you treat a horsefly bite?
• What time of year do horseflies bite?
• Why are horsefly bites so painful?
• Can you be allergic to horsefly bites?
• When should I worry about a horsefly bite?

Horseflies are typically larger than common houseflies, ranging from ½ to 1¼ inches (1.2 to 3.2cm) in length. They have stout bodies with large compound eyes and commonly have black, brown, grey or green colourings. Female horseflies are known to bite and feed on the blood of mammals, while male horseflies feed on nectar and plant juices.

Are you wondering what a horsefly looks like? From the appearance of horsefly bites to what you should do if you are bitten, take a look at everything you need to know...

What does a horsefly bite look like?

A horsefly bite can be painful, with the skin often turning red, itchy and raised. Depending on the bite, you may also experience a raised rash (known as hives or urticaria), and, in some cases, dizziness. You'll notice you've been bitten almost instantly, as horsefly bites can develop into large, red, itchy and swollen bumps within minutes.

How do you treat a horsefly bite?

If you have been bitten by a horsefly you should cleanse the bite immediately, using an antiseptic spray to decrease irritation and itchiness. In most cases, the horsefly bite will heal on its own, however, always head to your local GP if you notice it has worsened.

"Be sure to watch the area for signs of an infection, such as excessive pus or a foul odour. If you have any unusual symptoms, you should consult your doctor," explains Healthline. "Certain insect bites can cause more serious reactions. If you have difficulty breathing, a rash that spreads, or worsening pain, you should seek medical attention."

Precautions such as wearing protective clothing, using insect repellents, and avoiding horsefly-infested areas can help minimise the nuisance and potential bites from horseflies when spending time outdoors.

What time of year do horseflies bite?

Horseflies love damp areas and hot weather. During the summer months, you're likely to find them in pasturelands near creeks, damp woodlands and in long grasses. According to the Northumberland Wildlife Trust, peak horsefly season is between May and September.

Why are horsefly bites so painful?

Horseflies, also known as clegs, have razor-sharp jaws which cut into the skin rather than piercing it. Unlike mosquitoes, who release a mild anaesthetic, horseflies don't, which is one of the reasons their bites are so painful. Once the horsefly has locked into your skin, it will suck the blood, causing a sharp burning sensation. In most cases, this will lead to itchiness, inflammation, and swelling around the bite area.

Can you be allergic to horsefly bites?

It's uncommon to have a serious allergy to horsefly bites, but extra symptoms to look out for include dizziness, wheezing and swollen skin around the eye and lips. Always seek medical advice if you are unsure.

When should I worry about a horsefly bite?

According to the NHS, horsefly bites can sometimes take a while to heal and could become infected. You should see your GP if you have symptoms of an infection, such as pus or increasing pain, redness and swelling.

Citronella Candle

£16 at Amazon

Peppermint Oil

Now 15% Off£7 at Amazon

Insect Bug Repellent Essential Oil Blend

£6 at Amazon

Tea Tree Essential Oil

Now 15% Off£8 at Amazon

RepellShield Ant Spray Indoors & Outdoor

£14 at Amazon

Green Protect Crawling Insect Traps

Now 25% Off£6 at Lakeland

Pure Cinnamon (Bark) Essential Oil

£5 at Amazon

NAF Off Citronella Tag

£10 at Amazon

Citronella and Lemongrass Garden Candle

£48 at Country Living MarketplaceLisa JoynerDeputy Daily Editor, Country Living and House Beautiful

Lisa Joyner is the Deputy Daily Editor at House Beautiful UK and Country Living UK, where she's busy writing about home and interiors, gardening, dog breeds, pets, health and wellbeing, countryside news, small space inspiration, and the hottest properties on the market. Previously, she has written for Conde Nast Traveller, House & Garden and Marie Claire magazine. Lisa studied at University For The Creative Arts, where she completed a BA in Fashion Journalism.