1, the circumscribed method needs to make ">" at the junction of red and white lips at the top and bottom of the corner. A-shaped incision is used to remove a proper amount of skin above the corners of the mouth, which is mainly suitable for the corners of the mouth hanging from the outside of the upper lip. The effect is more obvious than that of the internal incision method, but slight scar marks may be left at the corners of the mouth.

2. Make an incision on the mucosal surface at the corner of the mouth by internal cutting method, which will not leave traces of the corner of the mouth, but the lifting effect is relatively slight. Both the internal incision and the external incision need to make an external incision about 12.5px at the root of the alar on both sides, but usually the scar is not obvious after healing.