It is not recommended to shave hair with a knife, which will not only make the hair more vigorous, but also hurt the skin on the face; In this case, there are two situations. One is to determine whether the cause of moustache growth is endocrine disorder. If yes, go to the hospital to clarify the cause and cooperate with drug control; If not, in a few cases, it can be taken out by stranding, which is old and requires skill. People around you don't know if it will, and then if there are many cases, you can consider going to the hospital for laser resection.