I have a red-tail with same circumstances. As a yearling he would rub is nose, and eventually tore up his face. He even escaped once and when he did he got stuck between the top of the enclosure and the screen top. I was at work, when I came home he had pulled and writhed so much that he ripped his lip. I took him to the vet immediatly they put him on antibiotics and I just had to wait for his shed to help start clearing it up. 13 years later Elvis still has the lip problem, almost looks like a cleft lip, however it has not impeded his eating or breeding, and he is a fantastic snake, who I use in shows and with children. The only draw back to it is that when he breathes you can hear him exhaling because his mouth doesn't close all the way. I would advise a trip to the vet but wouldn't be to conserned with it otherwise