my baby box turtle has a brown almost leathery spot on his head. It has not been there before. I thought at first it was dirt but it won't come off. I mist him four to six times a day and the temp is between 85 and 90 on the warm side and 75 to 80 on the cool side. He does not bury himself except at night and is very social. He responds to my voice and lets me pet his head and shell. He is eating well, mostly worms and crickets, and his eyes are clear and bright. He has also started to spread his legs out , like he is basking and just stays there. Is this normal turtle behavior or is there something wrong. His light is about a little less than two feet of the substrate. Is he being burned by the light? I am a little concerned so any help would be great.