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Hi, I'm Dr. Jeremy.
Can you send me a picture of your snakes tail so I can get a better idea of what's going on?
Sorry for the delayed response, the system did not inform me that you send pictures. Do you feed live prey to you snake? This looks like "scale rot", a skin infection caused by an injury typically. You snake is going to treatment with antibiotics and topical for the tail. If left untreated this will likely spread and / or he will lose his tail.
ok, let me know if you need anything else.