I'm worried my snake is heading toward marks like this. He always noses at the opening of his tank, and it's been worrying me for ages. He has a mark on his chin that looked like a bruise and a tiny sore on the top of his snout. He's been eating fine, but I would love to know what your vet says. I've been thinking about getting a larger tank, since I think my snake might just like to explore and needs more room.