Perhaps he`s only shedding for the first time. Or maybe it`s some kinda fungus or shell rot? I can`t get a very good picture of it, but three different places on his carapace, on the seams connecting his scutes, are turning a grey/white color. Is he simply starting to shed his scutes?
http://www.angelfire.com/weird/catwalks/pets/lloyd2.txt

