Pigmented nevus is also called nevus cell nevus, nevus, melanocytic nevus. There are moles on everyone’s body, how is a mole formed? It is formed by the abnormal increase and accumulation of melanin particles secreted by melanocytes or melanocytes in the skin. For example, the common nevus is formed by the accumulation of increased melanocytes into nests or clusters, while in nevus of Ota and freckle-like nevus, the increased melanocytes are scattered and can appear in different colors due to their different distribution shades. The removal methods of pigmented nevus include laser, electrolysis, freezing, chemical cautery, surgery, etc. In the selection of removal methods, laser treatment is preferred for superficial nevus with diameter less than 3 mm; for nevus with diameter greater than 3 mm, non-surgical treatment is likely to produce more obvious scar growth, so it is recommended to use shuttle excision or excision in stages (second surgery at intervals of 3-6 months); for nevus with larger area skin implants or various skin flaps can be chosen to cover them. In principle, all excised nevus specimens should be sent for pathological examination. In terms of adjuvant treatment, vitamin C and fruits rich in vitamin C can be supplemented appropriately, and topical hydroquinone antioxidants can be used to reduce melanin synthesis.