Here are some articles on hives causes and treatments.
https://thehorse.com/14663/hives-in-horses-symptoms-and-treatment
https://www.smartpakequine.com/content/Hives-in-Horses
http://www.ckequinehospital.com/page/165/Equine-Hives
Any advice regarding medications such as antihistamines or corticosteroids needs to come from your veterinarian that has a valid veterinary-client-patient relationship with you and your horse. The veterinarians on HVC cannot advise on dose or whether a certain medication is appropriate for your horse for legal reasons.
**The Vet Corner groups encourage members to establish a relationship with their local veterinarian, don’t wait until an emergency.**
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