If his skin is kind of loose and hanging, that might be an indication of dehydration.
this could also mean he is in the shed process.last night i watched my bp shed and i got freaked out pretty badly.i couldnt really see wat was goin on so i lifted the plant he was using to rub on and seen the skin around the belly was hanging and looked like a 1000 year old man.couldnt sleep a wink but wen i got up this morning i checked him out and a all good