Why is my horse’s skin hot and painful around fly bites?

Read time: 3 minutes

Overview

If your horse's skin feels hot and painful around fly bites, it's often because the area is reacting strongly to the bite itself. Commonly, this is a local irritation or sensitivity, but repeated bites, scratching, rubbing, or a minor skin infection can also make the skin feel sore and warm.

Most of the time, you can start by checking how widespread the reaction is and whether your horse seems otherwise well. If the skin is becoming more swollen, very painful, or the horse seems unwell, it's sensible to speak to your vet.

Things To Check

1. Check whether the soreness is limited to a few bite spots or whether the heat and pain are spreading beyond the original area.

2. Look closely for redness, swelling, broken skin, scabs, discharge, or damp areas where the skin may have been scratched.

3. See whether your horse is rubbing the area, stamping, tail swishing, or trying to bite at the skin more than usual.

4. Note whether the reaction appears after turnout, around the mane, belly, face, or legs, or during warmer parts of the day when flies are more active.

5. Feel whether the skin is only mildly warm or distinctly hot, and compare it with nearby areas on the horse's body.

6. Check for any signs your horse is generally off colour, such as reduced appetite, dullness, stiffness, or reluctance to be handled.

7. Think about whether there has been recent sweating, clipping, muddy turnout, or grooming that may have irritated the skin further.

Common Causes

The most common reason is a local fly bite reaction. Some horses simply react more strongly than others, so a bite that would barely bother one horse can leave another hot, sore and puffy.

Repeated biting can make the skin more inflamed, especially if flies are concentrating on the same areas day after day. Scratching or rubbing can then break the skin and make the area feel even more painful.

If the skin has been damaged, a mild surface infection can sometimes develop, which may make the area warmer, more tender and more swollen than you'd expect from a simple bite.

In some horses, fly bites can be part of a broader summer skin sensitivity pattern, where the horse becomes increasingly itchy or reactive as the season goes on.

What To Do

Start by keeping the area clean and dry. If the skin is only mildly affected, gentle rinsing and careful drying may help you keep an eye on changes without adding more irritation.

Reduce further biting where you can by moving your horse away from heavy fly pressure at peak times, improving stable or turnout management, and checking that rugs or masks fit comfortably if you use them.

Try to stop the horse from rubbing the area if possible, because that often makes the skin hotter and more painful. Keeping bedding, tack contact and grooming pressure light around sore spots can also help avoid extra irritation.

Monitor the area over the next day or two. If the heat, swelling or pain is increasing, or if the skin becomes broken or oozes, arrange veterinary advice.

Products That May Help

When fly bites are a recurring issue, a simple summer management routine can be helpful alongside good checking and cleaning habits.

Horse Fly Sprays & Summer Care

Item added to your cart