That does look to have decent body weight. I would pour some hydrogen Peroxide down those belly scutes. I guarantee it will fizzle up a storm too..LOL!, which of course means it is doing it's job killing the bacteria. That looks to be from moisture getting under the scales, then rotting the tissue after it got more advanced.
I also agree with Jorge, that isn't a regular Eastern Chain king getula, but looks to be an Outer Banks king (L. g. sticticeps), or at least the far greater percentage is Outer Banks gene-flow. Outer Banks can be somewhat variable just like any other type of snake, or it could descend from slightly further north of Buxton too, hard to say. But it isn't a normal mainland Eastern, that's for sure.
good luck getting it well man!
~Doug

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"a snake in the grass is a GOOD thing" 
my website -Serpentine Specialties