Why does my horse have bald patches on its back in wet months?
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Overview
Bald patches on a horse’s back in wet months are often linked to rain scald, especially if the coat has been wet for long periods. It can also be caused by rubbing, mud, poor coat condition or other skin irritation, so it’s worth checking the area closely rather than assuming it’s one thing.
Things To Check
1. Look at where the bald patches are. Rain scald often affects the back, quarters and topline, especially where rain sits on the coat.
2. Check for scabs, crusts, lifted hairs, redness or small sore areas under the hair loss.
3. Notice whether the skin feels wet, greasy, hot or sore, or whether your horse reacts when you touch it.
4. Think about recent weather, turnout time and whether your horse has been standing in rain, mud or damp rugs for long periods.
5. Check tack, rugs and grooming habits for rubbing, pressure points or anything that might be causing hair loss.
6. See whether the bald patches are spreading, staying the same, or appearing in more than one area.
7. Look at the rest of the coat condition. A dull, rough or very thin coat can make skin problems more likely.
Common Causes
Rain scald is a common cause in wet weather. It often starts when the coat stays damp for too long and the skin becomes irritated, with crusting and hair loss appearing over time.
Rubbing from rugs, tack or poor fit can also leave bald patches, especially on the back and withers.
Mud, sweat and general skin irritation may contribute too, particularly if the coat isn’t drying properly between wet spells.
Less commonly, skin parasites, ringworm or other skin conditions can look similar, so it’s sensible to keep an open mind if the pattern doesn’t fit the weather or doesn’t improve.
What To Do
Keep the area clean and dry where you can, and avoid heavy grooming over sore or crusted skin. If your horse is getting repeatedly wet, try to reduce how long the coat stays damp and make sure rugs, if used, are clean, dry and well fitted.
Remove obvious sources of rubbing or pressure and keep an eye on whether the patches are changing. It can help to take a photo every few days so you can spot if it’s improving or getting worse.
If the skin is only mildly affected, gentle coat care may be enough while you manage the wet conditions. If the patches are spreading or the skin looks more irritated, it’s sensible to get it checked.
Products That May Help
A gentle wash and coat-care routine may help support hygiene when a horse’s skin is getting damp or dirty in wet months, especially if you need to clean the area without being too harsh on the coat.
Related Questions
Is rain scald contagious between horses?
Can I rug my horse to help with wet-weather skin problems?
When should I stop grooming a bald patch on my horse’s back?
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.