Yeah I agree it looks like a shed may be starting in that area. Look for the dull/waxy skin to spread around the mouth and head over the next several days if that is the case.
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!