A month or so ago we got back from a barrel race where I had left one of my horses at home, and came to find him covered on each side of his barrel in hives. They were swollen hives, and of course I went into panic mode. Thankfully - a friend of mine is a vet tech, and told me to bathe him in iodine duluted water. Which I did for the next few days. We also immediatly went and bought a new flysheet with a neck cover on it, and a fly mask. We then were at a show the next weekend, and his hives had gone down but not completely. I was bridling him and my hand went under his jaw to feel three swollen glands, also the one near his throat seemed bigger so I panicked, and I didnt know what that mean. He also had one on his side that was tender to the touch. A traineer at the show said don't worry I don't think its anything... after several people freaked out because they thought he had strangles.
We had the vet out next morning, and they said its not strangles he has a hypersensitivity to insect bites and told us to bute him to get some swelling down. They called the next day and said he was also slightly anemic, so we started him on Red Cell. So after going through on this stuff he was fine, I took him off the red cell a few weeks ago. However, since the first time his glands had swelled up under his chin, you can see feel them. They are way bigger than they are normally.. doesnt seem to bother him. And he also has broken out in hives once again. (accidently left flysheet off for a day).
So my question is, Could there be an underlying reason this happens? I have had this horse since 07 and he has never reacted until now. I ordered him garlic bug off supplement, and also am considering getting him fly boots. Any input greatly appreciated! He is also on Healthy coat, and plantinum performance.