Melanocytic nevus is a common benign skin tumor, which is caused by melanocytes gathering into nests. Melanocytic nevus is a benign skin tumor of melanocytic origin, which is caused by melanocytes gathering into nests, and is divided into three types: junctional nevus, compound nevus and intradermal nevus according to the different locations of the cells in the skin. It may be related to heredity and ultraviolet radiation. It can occur at any age and in any part of the body. Generally, no treatment is needed for this disease. However, if the mole has unclear edges, uneven color, or grows rapidly, accompanied by bleeding, ulceration, itching, pain, etc., you should be alert and go to the hospital in time for surgical excision and complete pathological examination to make a clear diagnosis. If treatment is needed, consult a professional physician for advice.