Since it is hereditary, it is estimated that it is difficult to eradicate, just like a birthmark. The only way is to try it with a laser. I have a friend with an obvious black spot on his face. The laser is off. But I heard that this kind of thing will grow back in the future, so it is still a problem for your body to secrete hormones. This cannot be eradicated. I can only say that it should be played down as much as possible. I suggest that you add a little white vinegar to the washing water when you wash your face every day.