Almost looks like a belly-burn- maybe "road rash" (not trying to be funny). Poor snake, he's awfully thin, & dehydrated, but with TLC, probably has a great chance now, in knowledgeable hands such as yours. It hurts me to see a snake in such condition.
Wouldn't feed him right away- let him settle in, & gain hydration, then feed only small items (as if he's a hatchling) & don't rush meals- he's gonna take a while to recover.
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