shells

OK so here are some pics of my Aldabra hatchlings which I've owned for about a month. All three seem to be doing just fine and I have no health concerns to report at the moment. What I'd like to know is what, if anything, we are able to discern by examining the shells of our growing turtoises...

Double O's had a spot on her shell for at the very least the last 4 months or so. Sink photo is from 3 months ago, and the plastic tub photo is from today. The white chip is from old damage- I'm more curious about the little reddish spot on the rear acute. It looks like it's under the surface...

I read a post tonight as well as viewed some pictures of shells with white squiggly lines, perfect circles and perfect figure 8's. So I did a little research because I had thought I'd seen these structures before, but not in animals. After my research, I came back and read all the posts here I...