Looks more like an injury than a disease to me. Do you feed live? And if so, do you leave the rat/mouse in there unattended for awhile? OR...do you have a heat source inside the cage? A dangling bulb, for instance...or something else that can get hot that the snake may have come in contact with?
It may look worse after a fresh shed because the shedding process will pull the scabs off.
EDIT to add a couple more thoughts: Keep the snake on clean paper instead of aspen or other substrate that can cling to the wounds. ALSO....DON'T use "antiseptic"....use an "antibiotic" ointment that does NOT have any pain reliever in it. Human pain reliever can make them sick.
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