Small white spot

[katiep713]

So I noticed that my new baby African Sulcata has like a small spot of his shell that is white. I thought maybe it was just some of the calcium powder so I got it wet and it disappeared. But when it dried up it came back. And it's still there.
Is this anything that I need to be worried about?
Thank you for any adicice

 

[Jacqui]

Pictures would be very helpful.

 

[katiep713]

Here's a picture

 

[katiep713]

 

[katiep713]

I don't know why