I guess it COULD be the IMG gene? Can you post pics? I was reading about that recently, and it's a fascinating mutation.
From what I've been reading, the gene can manifest in more than one way, and usually the ball pythons look normal at birth. It can take up to a couple of years to start showing up. Then they will start developing increasing pale/white patches on the sides, and black/dark scales on top or scattered into the pattern. OR they shed one day and overnight look like perfect axanthics (quite a shock), and then slowly start developing black scales and getting color back over time until they're super dark and dirty-looking.
Every once in a while someone talks about their ball python shedding out and turning grey, and then the color comes back after a few sheds. There's some weird stuff going on out there. ^_^
As long as there doesn't appear to be any pink/red color around the patch, and the scales in it look normal and healthy, it's probably nothing to worry about--and you'll just have to wait and see what happens.
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