Pigmented nevus is a benign skin tumor and has no effect on health, so there is no need to worry about it. If you want to remove it for aesthetic reasons, you can go to a regular hospital to have it surgically removed, and you can avoid picking and scratching and friction stimulation. If a pigmented nevus suddenly becomes black in color, uneven surface, enlargement, exudation, ulceration, pain, itching or new pigmented nevus appears around it within a short period of time, it may be considered to be malignant. In this case, timely surgical removal is needed, and pathological examination should be performed to help clarify the diagnosis so that further treatment plans can be made.