The flaking is from the Polysporin. Oil based ointments turn scales to mush and they will lose their coating or flake off entirely. It happens if you use too much ointment, which is why polysporin or neosporin isn't recommended to use regularly.
It should go back to normal in the next few sheds.
And get a thermostat to control your UTH asap. Until then, I wouldn't use your UTH. It's not safe.
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