I took in a snake that had that a while back.. it was from the person not cleaning the bedding after the water dish was spilled.. he said if the snake was dumb enough to tip it over, he could deal with wet aspen. (classy guy)
after a couple weeks of me having her on clean bedding.. she healed right up.. it looked JUST like what you are showing.. (a few people here might even remember me asking what it may have been back then, lol)
So I agree that it looks like scale rot..
Get him on DRY substrate, and hopefully it will clear right up
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