If there is a mark, it was probably the mouse that bit him. If you feed live you always have a chance of the rodent biting your snake. Usually there is no harm done, maybe a mark or something. I don't have any albinos, but a friend of mine does and says you never realize how often they get bit till you get an albino. Anyhow, as long as he's not missing any skin or bleeding he'll be fine. I feed solely live and I've only had one bite that actually drew blood, but it was still minor. If their is blood, keep the cage clean, use newspaper or paper towels and apply neosporin (without painkillers) to the wound.