My rabbit had some GI issues and was taken to the vet last Monday, the vet gave an injection for fluids and some oral antibiotics. He recovered from GI issues well but two days later we noticed a red area of skin at the back of the neck where the injection was, about 5x3cm in area, was a little painful to touch for him back then. Now the redness has gone down slightly but the skin area has quite a bit of fur loss and become very flaky. There is a red spot from where I suspect the injection was given. I'm not sure whether this is mites or just a reaction to the injection, the pain seems to be gone now as he does not react when I examine the area and he doesn't even seem to notice it at all. My other rabbit did groom him a little in that area but not excessively (as far as I can see) as to cause overgrooming issues. He's an indoor rabbit and has never had this issue before or came into contact with infected rabbits. Any help is appreciated! Thanks!