My Horsefield tortoise has developed some white pigment around his eyes and I'm rather concerned. It's only appeared in the last day or two. I've read online that it could be dehydration but I don't see how that's possible as he normally soaks in his bath every single day for up to two hours. His behaviour hasn't changed and he's still been quite active, although he seemed tired just today. (I tried to get a better picture but my camera wouldn't focus).