This is what it looked like the night I found the pus.
http://i26.photobucket.com/albums/c1...s/boovent2.jpg
Sorry for the poor quality of the picture. If I could have gotten my husband to hold the snake while I took it instead of him being such a sissy..
Like I said, more reason to look them over regularly from head to tail. I caught this early enough that a couple good cleanings and some bacitracin on the area had it looking much better. There appears to be an abrasion on some of the tissue just inside the vent. Monday morning a visit to the vet and a shot of Gentocin and hopefully he's well on his way to healing completely. I'm continuing the cleanings and keep a bit of bacitracin on there. He's being kept on paper towels. The external vent area is back to looking normal, and damage can only be seen when you pull the scale back and open it a bit.