I recommend a very good method: go to the drugstore to buy a Chinese medicine called "arrowhead" and grind it into powder, then stir it with one spoonful of arrowhead and two or three spoonfuls of white vinegar, and then apply it to your face for almost a few minutes before washing. My expression is very serious. It hasn't grown since I used this method, but if the traces left before are removed, I can buy that Unes left-handed C eraser, which is very effective.