The disease pictured is a fatal disease common in milksnakes. It skips my mind just now as to what its called but that is irrelevent. The picture is rather poor, so i am not 100% certain that it is the same disease, but i am pretty sure it is. Almost 100%. There is no PROVEN cure for this disease, however many have treated it early by applying neosporin to the entire body of the snake. After you do that, clean and bleach the entire cage, and lay down paper towels as a substrate. Monitor the snakes carfully and re-apply the neosporin as needed. I am not promising anything but its worth a shot, especially if it hasnt progressed too far (besides, if you dont do anything the snake WILL die). Good luck and the best of wishes!