If it was about a foot, I doubt that the fall would have broken any ribs or damaged organs. Just do a quick check for abnormalities over his body. Not sure how he got out and I'm sure that you have already done this, but try and find out how he escaped. I am sure that his scales will grow back after a few sheds as long as there is skin left there. It's also advisable that you switch to paper towel substrate for a while, especially since he will be moving over that wound.
Also, I'm not really sure what kind of snake anti-infection products there are, but look around for some. Maybe someone else will reply with the answer to that.
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