Doctor first, I rubbed on the skin for a long time, then scratched the nail and much more, after that the skin became black and then I cut the upper layer of the skin with a nail cutter but the blood did not come out and the skin was completely red. Then after a few days the skin has turned completely black and has become very thick and has become very pits and lines, I can understand that you must have understood my point and will help me and yes in all this Mr. caused by bad habits I had no illness