Two types are generally selected. The first one is thread pressing, which is simple and painless, but you should leave three. If the pressing line is loose and dropped, it needs to be done again. This method is not obvious. The second is surgery, which requires a skin cut. It was obvious after it was done, but it was not obvious after three months. I had an operation, and it has been more than three years now, so it is impossible for non-professionals to see it.