There are several methods to remove nevus from face: 1.Laser therapy, which uses the instantaneous burst of energy of CO2 laser to break up or decompose pigment cells in local pigment tissue, and then macrophages swallow the crushed pigment cells and discharge them through blood circulation to achieve the effect of removing melanin. 2.Surgical excision, which is the most direct, simple and safest solution, is to surgically remove the lesioned tissue of nevus to prevent malignant changes due to liquid nitrogen freezing or laser treatment stimulation, with a small recurrence rate. 3.Erosion therapy, which is very risky and easy to damage surrounding skin. 3.Erosion therapy, which is very risky and easy to damage the surrounding skin. The local mole area should be cleaned, and the concentration of carbonic acid solution or sodium hydroxide solution should be diluted to 50% and applied to the skin of the mole area with a toothpick.