My first deer had an infected wound also. She was hit with an arrow that was shot straight down into the backstraps behind the vitals. The spine was hit but the spinal cord wasn't cut, it stopped the arrow from penetrating any deeper. The wooden shaft broke off under the skin and it scabbed over and created a huge puss pocket. I didn't know it then but it's probably the reason that the deer let an eleven year old boy sneak closer for a better shot. I bet she was in some kind of syptic shock from the massive infection.