09/10/2026
Uh oh! You've brought in your horse from turnout and notice these raised bumps all over! When you investigate further, you might notice your horse seems really itchy. What are these?
Frequently, a sudden breakout of bumps all over a horse's neck and body are a symptom called hives. This is typically an immune response to a contact allergen, the most common of which are pollens, medications/supplements, or food.
What should you do? Don't panic. While contacting your vet, you could start to offer your horse some relief by rinsing them thoroughly with lukewarm or cool water. If any of the horse's coat is sticky or sweaty, bathing them with a mild shampoo or detergent like Dawn can help lift the offending allergen (if pollens/molds/etc are the cause). Sometimes, medical intervention with a steroid or epinephrine is reasonable or necessary depending on the extent of the hives or their persistence. If there is a known new food or supplement that's been added, removing it from the horse's diet can help identify a diet source of irritant.
The good news is most hives will resolve within 24-48 hours on their own. If they don't or seem to be worsening before your eyes, it is best to get your vet involved. Not sure if they are getting bigger? Pick a few, outline them with a permanent marker or a whiteout pen, and check them again in an hour or two.
For more information on hives, check out this helpful article on.The Horse: https://thehorse.com/122959/hives-in-horses/