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I was reading the health section and there is a section about Shell rot, can anyone show me what shell rot turtle may like? does it occur in plastron area(belly part)? or scute area?(top part of the body)

Try looking here: http://www.austinsturtlepage.com/Care/emergencies.htm

And as I understand it, shell rot can occur on both top and bottom thus the need for a basking area that they can completely dry all parts of their shell on.

Try http://www.austinsturtlepage.com/Care/medshell.htm for pictures. It can occur anywhere on a turtle's shell.