Nevus mainly refers to pigmented nevus. For pigmented nevus with indications for surgical excision, it can be completely cured by surgical treatment, while some pigmented nevus with smaller diameter can be treated by non-surgical treatment. A pigmented nevus is a benign skin tumor formed by the aggregation of melanocytes and is commonly found in the population. Most pigmented nevi have no uncomfortable symptoms, but a few of them may develop malignant changes, such as ulceration or erosion on the surface and obvious changes in appearance in a short period of time, and should be surgically removed as early as possible. Generally speaking, pigmented nevi do not need special treatment. For those that have cosmetic needs, are often rubbed and have a tendency of malignant transformation, appropriate treatment can be chosen according to their nature and size. Generally speaking, for nevi with a diameter of more than 5mm and a tendency to become malignant, they can be completely removed by surgery and the nature of the nevus can be clarified by pathological examination; for nevi with a diameter of less than 5mm, they can be removed by laser treatment, electrocautery, freezing and other treatments. Consult your physician for specific advice.