I came home yesterday to this. The pictures are after I cleaned it up a bit. That is why it looks wet. The area is warm to the touch. 2 weeks ago he did have 1 shot of 4-way in his neck and 5 shots of Gentamicin in a 4 day period due to recieving a very deep puncture wound to the chest with a stick. The stab wound is healing great, no swelling and it is starting to close up. This rash thing started the day after the vet gave him his shots. It was small, looking like a bite wound so I passed it off as a bite from the other horses and put some vetericyn on it. Next day it was a little bigger and goey. Put more vetericyn. Day after I noticed it was still getting worse so I stopped the vetericyn to let it dry out. From then on it stayed dried out and the same size. So I left it alone. For the past few days we had some rain. I went out yesterday to find the area now looking like this and really hot to the touch. It almost seems when the area does not stay dry it gets worse. Now he is itching his mane out , a nightmare.
He is eatting his normal hay, alpha/orchird mix. Also a month ago I started him on Equidae pellets mixed with a two small caps full of AniMed Flax oil due to the fact he had really dry skin and was itching his butt off then. He stopped itching his butt and it's growing hair back so I guess it worked. We did find a few stickers in his hay (we are going to get new hay) but last time that happened he had diarrhea and he is pooping fine. So I am leaning toward it being the shots. We are still waiting on a response from my vet. Any clue on what is going on? Thanks.