Why is my horse losing hair in clumps under scabs?
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Overview
Clumps of hair coming away under scabs is often seen with rain scald, which is a skin problem that can happen when the coat stays damp for too long. It can also happen with other skin irritation or infection, so it’s worth checking the area closely rather than assuming it’s just a dirty patch.
Things To Check
1. Check whether the scabs are on the back, rump, neck or quarters, where rain scald often shows up first.
2. Look at whether the horse has been wet for long periods, especially after rain, heavy sweating, or muddy turnout.
3. See if the scabs lift off with tufts of hair underneath, or if the skin looks sore, red or cracked.
4. Feel the surrounding skin for heat, swelling or tenderness.
5. Check whether the horse is rubbing, stamping, or seeming uncomfortable when brushed or rugged.
6. Notice whether the problem is spreading, or whether it’s limited to one patch.
7. Think about any recent changes in rugging, turnout, grooming, washing or the weather.
Common Causes
Rain scald is a common cause, especially when the coat stays damp and scabs form with small tufts of hair attached.
Skin irritation from prolonged wetness, rubbing from rugs, or muddy conditions can look similar at first.
Less commonly, a bacterial skin infection, fungal issue, or insect-related irritation may be involved, especially if the skin is very sore, smelly or spreading.
What To Do
Keep the area as dry as you can and avoid letting the horse stay wet for long periods. If the coat is dirty or muddy, gentle cleaning and careful drying can help you see the skin properly and monitor any changes.
Don’t pick scabs off forcefully, as that can make the skin sorer. Try to reduce rubbing from rugs or tack, and keep an eye on whether the patch is getting larger, wetter or more uncomfortable.
If the horse is turnout-heavy, think about whether shelter, rugging or a change in routine could help limit how long the coat stays damp.
When To Contact A Vet
Contact your vet if the area is spreading, very sore, warm or swollen, if there’s discharge or a bad smell, or if your horse seems unwell. You should also get advice if the scabs keep returning, the hair loss is extensive, or home care isn’t improving things.
Products That May Help
If your horse’s coat is getting scurfy, matted or difficult to keep clean around the affected area, a gentle wash routine can be useful as part of everyday skin and coat care.
Related Questions
Is rain scald contagious between horses?
Should I clip the hair around rain scald?
How do I keep a horse dry in wet weather?
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.