I live in Northern Nevada, and my horse has 5 small raised bumps on his back. They are VERY painful for him, I can't even touch him without him practically dropping to the ground. I'm thinking they are some kind of parasite, and I have to call the vet out, but I was wondering if anyone has had anything similar to this happen? He doesn't have ringworm and there are no sores. He isn't broke to ride yet, so it doesn't have anything to do with a saddle. Can anyone clue me in?