What's this?

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Saw this guy in our private facebook group.. Seems like the owner is having problem with his snake and doesnt know what to do 😞. He said that one day his snake just wont eat and then its skin started to slough off. at first he tought that its just a regular wound but it kept comming throught the snake's whoke body.... Does anyone had a similar experience... Btw this snake was already brought to the vet and I just want to know more about this condition 👍