We're definitely going to need to know what the temperature are in there. And if there's any possible sharp or tight decorations they may have been squeezed into.
If it was discoloration from the substrate it would usually be on the belly and not on the back. I'm on my phone right now so I can't get the best look, but it could be something as simple as some poop... It can happen. Or I'm a little more worried about it being something like a burn or possibly some injury from squeezing into places like decor.
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