Nevus pigmentosus may not need to be removed if it is small in size, but if it is large in size or has severe symptoms, it needs to be removed. Nevus pigmentosus may be related to heredity, developmental defects and other factors. The color of skin lesions is variable and can be brown, tan, black and so on, and the shape is usually spots, papules, plaques, patches and so on. If the size of nevus is small, generally no treatment is needed, if it affects the appearance and mental health, physical therapy can be used, if the size of nevus is large, the symptoms are serious or there is a tendency of malignant transformation, surgical excision method should be given for treatment. Don’t scratch the nevus with your hands, if the nevus suddenly increases in size, deepens in color, breaks down or bleeds, it is recommended to go to the hospital in time for consultation and treatment.