I worked for a vet for years. And while that doesn't make me any kind of expert I can tell you that small punctures from a claw or sharp toothed animal (cat or coon) can easily get infected that bad. It's because the tooth or claw is so sharp that it pierces deep but then the holes "self-seals" for lack of a better word. So the infection takes hold and it gets pretty ugly and abcessed before it's all over with. I would think with paper thin chicken skin it's entirely possible that it's an abcess and not a contagious disease. And keeping it opened and clean is best.
I'm new to chickens so I'm on my way to look up coryza. But I just wanted to throw in my 1/2 a cent.
I'm new to chickens so I'm on my way to look up coryza. But I just wanted to throw in my 1/2 a cent.