There's a few possibilities. It could be MBD which sometimes causes spinal cord deformities. That's a pretty remote possibility though if you haven't noticed tremors and muscle weakness.
There could be an abscess, an infection under the skin. Or it could be a tumor, cyst, wart, etc. It's best to have a qualified reptile vet do an exam and perhaps a needle biopsy.
Good luck and keep us posted.
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