phtanus said:My baby cherry has a very similar problem. Her scales are turning white/light color and she grows slower than the other male cherry tort.
I really don't know why this happens.
See my post before :
http://www.tortoiseforum.org/Thread-My-baby-redfoot-s-scales-turn-white#axzz1sJtxST7u
Try soaking your tortoise in some distilled water for 10-15min, then scrub the affected regions with a soft-bristled toothbrush. When I did this, a lot of the minerals (crud) came off. Let us know what happens for you. Coagi's head looks similar to your torts, but I think this is likely mineral deposits again.