Riley had suffered a bad bout of mites before I received him. On his cheek area he still has a circle spot of dark brown damaged quills. But since I've had him it doesn't appear to be worsening or healing. (have had him a couple months now I think) Should I try to remove those damaged quills? Would new ones grow in? I don't want to hurt him, they are just ugly and I thought maybe new growth would be better, if that is possible. Sort of matted damaged looking in that area. The area is about the size of a pencil eraser.