Personally I'd have him seen by a vet as soon as possible, I'd not feed until the vet said to do so or the skin lesions are healed and I'd put the snake on several layers of plain white paper towel as a substrate (Viva makes a very nice almost clothlike quality papertowel). If the vet says to feed I'd likely feed a smaller than normal prey item in order to not put much strain on the snake while it's skin condition is so abnormal. You don't want to risk a rodent nail scratch or a lot of stretching on skin that's already compromised, I would think.