I was petting my rabbit Mac this morning before letting him out of his cage for the day, and I noticed one of his eyes has a slight red tint around it that his other eye does not have. The corner of his eye is very red and it looks a tiny bit swollen. When I gently ran my finger over it he didn't seem to be bothered by it, and other than it looking physically concerning to me, he doesn't seem to show any sort of behavior changes or issues. It doesn't seem to be leaking or anything of the sort. Should I be worried? Or am I just overreacting?