A large mole may be a pigmented mole with a large diameter. If the diameter is more than 3~4mm, laser removal is generally not recommended. If the diameter of pigmented nevus exceeds 3~4mm, laser removal of nevus is generally not recommended. Forced laser treatment of pigmented nevus with large diameter is likely to lead to localized pigmentation and scarring, etc. Scar contraction may lead to localized pits. Pigmented nevus is an abnormal growth of the skin, if the surface is prominent and the thickness is large, laser treatment is not recommended. This is because it is difficult to remove a large diameter pigmented nevus with a single laser treatment. If laser treatment is used repeatedly, it will irritate the nevus repeatedly and may cause malignant changes in serious cases. To summarize, it is recommended that patients who are willing to have pigmented nevus treatment should go to the dermatology department of regular hospitals for consultation and treatment with the advice of specialists.