Hi there, just looks like a dark stained shed. It should come off in the near future but if he enjoys soaks you can do a 10 minute warm soak every few days or lightly spray him in his tank if the humidity is low. Other than that it will still come off on it's own.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!