Ok so its not a rat bite I feed all my snakes pre killed but any ways I have a 5' male boa that I purchased. When I got him he had pnemonia and mites. A few days into treating him I noticed a lump on his side.
Thinking it was an abcess of some kind I soaked him to drain it. The wound seemed to open but the scales seemed to be rotting off. I don't exactly know what actually caused it but I cleaned the wound daily and put neosporin on it. Within 3 day thins wound that was originally the size of a quarter had spread from the middle of his belly to just over the middle of his back and was about 5" long!
So What I started doing was cleaning his tank really well every day and NOT the would. No Neosporin nothing. I kept him very dry. Within a week he was 50% healed the following week he shed and was about 90% healed. And he keeps getting better. I believe that the neosporin was keeping the moisture in and was giving him some kind of scale rot.
I don't know if this will help seeing its a different type of wound but I figured I would throw it out there for you.

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