Most benign melanocytic nevi do not require treatment, and the general principle is that if they are not treated, they should be treated completely. If the nevus occurs in a part that is prone to friction and damage, it is best to remove it surgically. Small lesions can also be treated with ultra-pulsed CO2 laser and/or Q-switched laser. Ordinary CO2 laser, freezing, ultra-high frequency electricity, chemical peeling, etc. is more difficult to grasp the depth, easy to leave scar or incomplete treatment. 2.Surgical excision as far as possible. Since malignant changes usually occur after 30 years old, the time of excision can be left until adulthood. 3.Treatment of congenital giant nevus Since the malignancy rate is high and half of the malignant changes occur before the age of 5, it should be removed as early as possible after birth. 4.Surgical treatment should be taken for suspected malignant changes All removed moles should be examined pathologically, and if malignant changes are found, the removal should be expanded and treated as appropriate.