It is possible for a pigmented nevus of the scalp to recur three years after its surgical removal. A pigmented nevus may be a benign proliferation of certain misshapen tumors or melanocytes, with lesions of variable color and in the form of papules, spots, patches or plaques. For surgical excision of pigmented nevus of scalp, the doctor will usually expand the cut slightly outward and choose deeper depth, and generally it will be cut cleanly, and there will be no recurrence in this case, but there are a few patients with incomplete excision phenomenon, and there are some nevus cells left, in which case even if surgical excision is performed for three years, it may lead to recurrence. Patients with scalp pigmented nevus should closely observe whether the skin of the affected area changes on a daily basis. If the skin of the affected area changes, such as rapid growth, ulceration and other symptoms, they should go to the hospital in time.