My Hermanns tort seems to have got these patches on his shell.
They are like rings and lighter in colour, under the shell surface.
He gets regular soakings and enough UVB and vits.
I think you're talking about those little white curley q's inside the shell, right? This is perfectly normal. Someone told me a long time ago that it was the calcium making its way through the shell. I don't quite believe that, but don't worry about it. It seems to be more prevalent in the Mediterranean species.