Why is my horse’s skin blistered after sun exposure?
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Overview
Blistered skin after sun exposure can happen if your horse has had sunburn, but it can also be linked to skin irritation, a photosensitivity reaction, or rubbing where the coat is thinner. The important thing is to check the skin carefully, reduce further sun exposure, and watch whether the area is settling or getting worse.
Things To Check
1. Check whether the affected area was exposed to strong sun, especially on white, pink or thin-skinned areas such as the nose, muzzle, around the eyes or other lightly pigmented patches.
2. Look for redness, heat, swelling, blistering, broken skin, scabs or any discharge.
3. Notice whether the horse is uncomfortable when touched, grooming is causing pain, or the skin seems tight or sore.
4. Think about whether anything else could have irritated the skin, such as a new grooming product, fly spray, wash, plant exposure or tack rubbing.
5. Check if the horse has been sweating heavily, clipped recently, or has a very short coat that may leave the skin more exposed.
6. See whether more than one area is affected, since widespread signs can suggest something other than simple sunburn.
7. Monitor whether the blisters are dry, shrinking or starting to crust, or whether they are spreading or becoming more inflamed.
Common Causes
The most common cause is sunburn, especially on pale or unpigmented skin after prolonged sun exposure.
Skin irritation from grooming products, plants, or tack friction can sometimes look similar, particularly if the area has been rubbed repeatedly.
Photosensitivity is another possibility. This is when skin reacts unusually to sunlight, sometimes because of an underlying issue, a feed-related reaction or a plant-related trigger.
Less commonly, blistering can be linked to a skin infection or another skin condition that needs veterinary assessment.
What To Do
Bring the horse out of strong sun if you can and keep the affected area shaded.
Do not pick at the blisters. If the skin is open, keep the area clean and avoid anything that might sting or irritate it further.
Review turnout, grazing times and any recent changes to grooming, washing, sprays or tack so you can spot a likely trigger.
Keep an eye on whether the skin is improving over the next day or two, or whether it is becoming more painful, swollen or widespread.
If the area is on the face, keep a close watch on the eyes and nostrils as well, since these areas are often more exposed.
When To Contact A Vet
Contact your vet if the blistering is severe, spreading, very painful, or affecting the eyes or nose. You should also get advice if your horse seems unwell, the skin is oozing, or you suspect photosensitivity rather than simple sunburn.
Products That May Help
Keeping a horse’s coat and skin clean, calm and free from unnecessary irritation can be useful while you’re monitoring a sun-exposed area.
Related Questions
How can I tell if my horse has sunburn or skin irritation?
What parts of a horse are most likely to burn in the sun?
Can photosensitivity cause skin blistering in horses?
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.