It looks like trauma but if it's getting worse you need to take it to a vet. I'd keep it on paper towel and keep the humidity down until you can get it to a professional. I don't see signs of infection which makes it hard for me to give any real recommendations. It could possibly be an internal organ issue, sometimes that manifests in scale/skin degeneration. If this was improving and it was my animal I may have passed on the vet, but if it were my animal and this issue was worsening I would be in contact with a professional for sure. Best of luck and keep us updated.

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