On Friday, I noticed this strange spot on my Grey Treefrog, Squidge. At first I thought she may have burned herself on a light that had settled onto the tank lid and that it was scarring - so I immediately removed the light and started monitoring her closely. However, the spot doesn't seem to be uncomfortable for her, she's acting totally normal, and the spot isn't changing (it's not getting bigger or healing, it's just there).

You can see it here (smooth and bluish-grey, right above her right leg). What could this be?

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