Pigmented nevus is the most common skin swelling, and it is a common concern of patients due to its aesthetic impact and fear of malignant transformation. We can use a simple surgical method – fractional excision for treatment. The following is a brief introduction to fractional resection. Fractional excision is a multiple excision of the lesion, using the skin’s own elasticity to extend the excess skin over time. Fractional excision has 3 major benefits, one can be to shorten the final scar length, two is to avoid excessive tension on both sides of the wound to make the final scar too wide, and three is to change the direction of the scar so that the scar direction eventually follows the skin relaxation line thus obtaining a better cosmetic result. It is suitable for small to medium sized moles. Note: The first excision should remove as much lesion tissue as possible, and the interval between excisions should be about 3 months, too short an interval can not effectively expand the normal skin around the lesion, too long an interval can not achieve the effect of excision in stages because the lesion tissue will become very large due to pulling. In addition, after each excision of a part of the nevus lesion, the lesion will rebound and widen to a certain extent due to tension and other reasons, which is a normal phenomenon, so don’t worry about the malignancy or growth of the pigmented nevus. Secondly, in some parts that are very sensitive to the pulling force, such as the lower lid and corners of the mouth, if the area of the nevus is large, the method of split excision may lead to the displacement and deformation of the above-mentioned structure, and at this time, skin expansion technology should be considered for treatment; finally, for larger nevus, the method of split excision should not be used for treatment.