What should I do if my horse's mud fever looks infected?
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Overview
If your horse's mud fever looks infected, it's sensible to treat it as more than simple mud and skin irritation. Look for heat, swelling, discharge, a bad smell, spreading scabs, pain or worsening lameness, then keep the area clean and dry and speak to your vet if it doesn't settle quickly or seems to be getting worse.
There can be several causes behind this, including mud fever that has become more irritated, a skin infection, trapped moisture, rubbing, or another skin problem altogether. You can't tell the exact cause from appearance alone, so checking the full picture matters.
Things To Check
1. Check whether the area feels warmer than the surrounding skin or if the leg is swelling.
2. Look for discharge, oozing, crusting, a strong smell, or scabs that are becoming wetter or darker.
3. Notice whether your horse is more sore than usual when you touch, clean, or pick around the area.
4. Check if the skin is cracked, raw, bleeding, or if the sore patches are spreading.
5. Watch for any change in how your horse is moving, including stiffness, short steps, or obvious lameness.
6. Think about recent turnout, muddy conditions, stable wetness, washing, clipping, or anything that may have kept the skin damp.
7. Look at whether one leg is affected or whether there are signs on more than one leg.
8. Note if your horse seems dull, off their food, or unusually uncomfortable.
Common Causes
The most common reason is mud fever that has become more inflamed because the skin has stayed wet or muddy for too long. Once the skin barrier is damaged, bacteria can get involved and the area may start to look infected.
Other common causes include skin irritation from washing, rubbing, or harsh grooming, as well as trapped moisture under feathers or long hair. Sometimes the problem is a bacterial skin infection that needs a vet to confirm and manage.
Less commonly, a different skin condition or deeper infection can look similar at first, which is why it helps not to assume it's just mud fever if the area is getting worse.
What To Do
Keep the leg as dry and clean as you reasonably can, and avoid repeatedly soaking or scrubbing the area. If there are loose surface scabs, don't pick at them forcefully, as that can make the skin more sore.
Remove obvious mud gently, monitor the area at least once daily, and make a note of any changes in heat, swelling, discharge or comfort. If turnout is very muddy, try to reduce exposure where possible and improve the horse's living conditions as much as you can.
If the skin looks angry, is spreading, or your horse is uncomfortable, it's sensible to get veterinary advice rather than waiting for it to clear on its own.
When To Contact A Vet
Contact your vet if the area is hot, swollen, leaking discharge, or becoming more painful, or if your horse is lame, dull, or not improving with basic care. You should also speak to your vet if the skin damage is spreading, there are multiple areas involved, or you're unsure whether it's simply mud fever.
Products That May Help
Keeping the lower legs and surrounding area clean can be part of a sensible mud fever care routine, especially if your horse is living out or getting muddy often.
Related Questions
How can I tell if mud fever is getting worse?
Should I wash mud fever every day?
Can mud fever spread to other legs?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.