The father in law said it was a large swollen lump and when the vet lanced it, puss shot out like a water gun across the room. The vet said that this isn't the first case they had seen like this and said that they never advise people to inject banamine intra-muscular but only orally or into a vein. I should have taken a picture of his left hip because the vets have three cuts about 4 inches long sliced open right now to drain the infection and allow air into the wound since the bacteria can't survive in an oxygen rich environment.
I had never heard of this happening before and just thought I would post something to hpefully avoid this type of situation for anyone else!
Have a great day!