Recently, I noticed something a bit odd around the mouth of my tortoise. Around his mouth was a little white, which I figured was just him messily eating his food with the powder around his mouth. This really couldn't be a problem because I add a little calcium powder to his food 3 times a week. However, a couple of days later it seems like he has grown a five o'clock shadow kind of look around his mouth. I am not really sure what it is, I figured he could be eating his substrate or be dehydrated but I have never seen him eat it and he gets soaked quite often, sometimes twice a day if I get a chance. He seems to be drinking the water when I soak him, so I can't really find out what is wrong. Anyone have any ideas or similar problems to this?