Hello, and welcome to Just Answer. I'm sorry to hear that Lizzie is having this problem. What you are describing sounds much like hives. This is a typical allergic reaction, usually due to a bite or sting of some sort. It is unlikely that the feed change is the root of this problem. They will really cause no problems, and should go away on their own, usually over about 24-48 hours.
Hi, she seems to have had them for a while or at least they wont go down they have scabs on the end of them but wont heal and go down Thanks Sarah
The only thing I can say this sounds like is hives. It still would be an extremely rare case if this was due to the feed change. The only real suggestion I could make would be to try giving 10cc Dexamethasone once daily for 3 days. This is a steroid that can be purchased at most vet supply and many feed stores.
Many Thanks Dr Larson
You're welcome. I hope the information is helpful.