It could be dehydrated, if there are no external parasites. Judging by your saying that he'll only use the humid hide if it's really wet, I'd say it's dehydrated. Blister Disease, from too much moisture, will start out as a discoloration of the scales...kind of brownish. Then it will move onto small open sores or blisters. If you notice anything like this, at all, take it to the Vet because any spot of infection you can see on the outside is about twice as bad on the inside. You seem to be staying on top of it, though, so carry on. Try the idea of putting a hide in place of the water dish and putting the dish somewhere else.

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