Turtle shell issues

Hi all, my red eared slider had started to develop white pigmentation on the shell and the underside about a month ago, i have been applying betadine daily (at first i suspect it is shell rot) and increased its dry docking time + sun exposure time, but it didn’t seem to get better.


May i get some advice on what else i can do / if to see a vet, which vet is recommended.


Thank you so much!

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