This is the underside of Leo’s chin, the scales themselves are not dark but the skin underneath them is pitch black. It’s more visible when you ruffle his scales:
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!