Pigmented nevus is actually a kind of tumor on the human body surface, which can be distributed in any part of the body, and its color, size and shape vary greatly in different individuals. When pigmented nevus is located on the exposed parts of the face, it often affects the beauty, and benign pigmented nevus can also become malignant due to chronic stimulation, repeated friction and scratching, improper digging and drug corrosion. So how to treat pigmented nevus and what is the effect of pigmented nevus after treatment? In this article, we will explain different types of pigmented nevi one by one. The infiltration depth of these moles usually lies in the superficial layer of the dermis, and the laser can achieve better treatment effect. However, since laser is not a radical excision, there is a certain chance of recurrence after treatment, and laser or surgical excision is needed again. For pigmented nevi that cannot be removed by laser, surgical treatment is required. Pigmented nevus with small size and usually within 25px in diameter can be removed at once by direct excision. For larger pigmented nevi that do not protrude from the skin, in order to reduce the length of the postoperative scar, they are usually removed in 2-4 times, depending on the area, with an interval of 3 to 6 months between each surgery for the scar to soften and stabilize. For nevus with large body area and irregular shape, it is necessary to be admitted to hospital for treatment. Treatment is usually excisional implantation or dilator repair. The advantage of this procedure is that the surgery can be completed in one time and the pigmented nevus can be completely removed at one time, but the disadvantage is that the skin after transplantation will change its pigmentation and the color will be different from the surrounding skin, and new scar will be formed at the place where the skin is removed. Dilator repair involves transplanting an artificial water-filled dilator underneath the normal tissue adjacent to the pigmented nevus and then dilating it with water every week to expand the normal skin and increase its usable skin area, usually after 1 to 2 months of expansion, a second surgery is performed to cover the expanded skin over the excised area of the pigmented nevus to complete the treatment. The advantage of this method is that the expanded skin is similar in color and texture to the surrounding skin and has a better appearance, but the disadvantage is that the procedure needs to be done twice, and the patient’s appearance is strange during the water injection and expansion process, and care needs to be taken. In addition to the above common methods, there are also treatments such as adjacent flap transfer and flap free grafting to treat specific pigmented nevi. Each patient needs to meet with the treating physician before treatment in order to develop a suitable treatment plan for him or her.