Raised lumps and scabs on my horse’s back and rump | arlo.® Atlas
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Overview
Raised lumps and scabs on the back and rump are commonly seen with rain scald, which is often linked to prolonged wet weather, damp skin or a coat that stays wet for too long. Other skin issues can look similar, so it’s sensible to check the area closely rather than assume it’s one specific problem.
If the skin is only mildly affected, good observation, gentle care and keeping the horse as dry as practical may help things settle. If the skin is sore, spreading or not improving, it’s worth getting veterinary advice.
Things To Check
1. Check whether the problem started after rain, turnout in wet conditions, or a spell of damp weather.
2. Look closely for scabs that lift off easily, small raised bumps, redness, crusting or any wet patches under the coat.
3. Feel for heat, tenderness or swelling, especially if your horse objects to being touched or groomed.
4. Check whether the skin is limited to the back and rump or whether there are similar changes elsewhere on the body.
5. Note whether the horse has been clipped, has a thick winter coat, or is carrying mud and moisture against the skin.
6. Think about any recent changes in rugs, turnout, stable conditions, grooming routine or bedding.
7. Watch for scratching, rubbing or signs the horse is uncomfortable when the area is brushed.
Common Causes
Rain scald is one of the most common reasons for scabs and raised crusts along the back, rump and topline, especially when the coat stays damp. It can look like small tufts, bumps or scabs that sit over irritated skin.
Other possibilities include mud-related skin irritation, rubbing from rugs or tack, or general skin sensitivity. Less commonly, a bacterial skin infection or another skin condition could be involved, especially if the skin is sore, oozing or spreading.
What To Do
Keep the area as clean and dry as you can without over-washing. If the coat is wet, allow it to dry properly and avoid covering damp skin with rugs if that can be helped.
Be gentle with grooming. Don’t pick scabs off, as that can make the skin more irritated and delay healing.
Review the horse’s environment too. Wet turnout, poor shelter, damp rugs and muddy conditions can all make skin problems harder to clear up.
Monitor the area over a few days. If the patches are staying the same, improving, or getting worse can help you decide whether more help is needed.
Products That May Help
If your horse’s coat and skin need regular washing as part of routine care, a suitable wash can help support gentle cleansing without overdoing it.
Related Questions
How can I tell rain scald from mud fever?
Should I wash scabs off my horse’s back?
When should I get a vet to look at skin scabs?
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.