Why does my horse have thick scabs on the back of the fetlock?
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Overview
Thick scabs on the back of the fetlock are commonly seen with mud fever, especially if your horse has been standing in wet, muddy ground. It can also be linked to skin irritation, minor rubbing, or a skin infection, so it’s worth checking the area carefully rather than assuming it’s just mud.
Things To Check
1. Look at whether the scabs are on one leg or several, as mud fever often affects the lower limbs and may show up on more than one side.
2. Check for redness, heat, swelling or tenderness around the scabs.
3. See whether the skin is cracked, weeping, sore or starting to lose hair.
4. Notice if the problem seems worse after turnout, wet weather or time in muddy ground.
5. Feel whether your horse objects to having the area touched or cleaned.
6. Check for a crusty smell, discharge or sticky skin, which can suggest the area needs closer attention.
7. Make sure there isn’t a rubbing point from boots, bandages or tack that could be irritating the back of the fetlock.
Common Causes
The most common cause is mud fever, which is often triggered or made worse by prolonged wet, dirty conditions. The skin on the lower leg becomes irritated, then scabs can form as the area tries to heal.
Other common causes include simple skin damage from mud, small scratches, or repeated rubbing from turnout boots or other equipment.
Less commonly, similar scabs can be linked to a skin infection or another skin condition, especially if the area is becoming sore, spreading or not improving.
What To Do
Start by keeping the area as clean and dry as you reasonably can. If the scabs are loose and the skin isn’t sore, gentle cleaning may help you see what’s going on underneath.
Avoid picking scabs off if they’re firmly attached or the skin looks painful, as that can make irritation worse. If the legs are muddy after turnout, rinse off excess dirt carefully and dry the area well afterwards.
It can also help to review the horse’s turnout routine, especially if they’re spending long periods in wet ground. Where possible, try to reduce time in deep mud and keep bedding, stable areas and grooming kit clean.
Keep an eye on whether the scabs are spreading, getting more uncomfortable or not settling with basic care. If you’re unsure whether it’s mud fever or something else, it’s sensible to get it checked.
When To Contact A Vet
Speak to your vet if the area is becoming swollen, hot, very painful, or if your horse is lame, dull, or unwell. You should also get advice if the scabs are spreading, there’s discharge, or the skin is not improving despite sensible home care.
Products That May Help
For horses dealing with muddy turnout and lower-leg skin issues, a routine focused on cleanliness and dry-leg care can be helpful as part of day-to-day management.
Related Questions
Is mud fever always caused by wet ground?
Should I pick off scabs on my horse’s fetlocks?
How do I clean muddy legs without making them sore?
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.