As we grow older, with the wind and the sun, with the endocrine changes, human skin inevitably leaves traces, one of the most common on the black moles, commonly known as nevus, some say pigmented nevus or mole cell nevus. How to remove it? Although some pathologists theoretically believe that moles should be surgically cut so that they are complete. However, domestic and foreign clinics perform non-surgical treatment for small moles (generally within 2mm). The reason is very simple, that is, we use physical and chemical methods to make the pigmented nevus necrotic, and when it falls off, there will be no problem of malignant change due to stimulation, which pathologists worry about. Which one is more effective? For a suitable size mole, an experienced doctor can remove the pigmented mole better with either method. Small moles can be treated with CO2 laser (Q laser does not treat pigmented moles), the advantage of which is that it is precise and not easy to leave pigmented marks common with potions, and not as easy as freezing to a large extent. Of course, for deep moles, laser may not be able to remove them at once and they may recur. But remember, large moles must be operated, although non-surgical can also be removed, but it is easy to leave residual recurrence and more likely to leave a pit-like scar.