The appearance of a small mole at the edge of a nevus may be caused by a pigmented nevus or a benign growth, which can be left untreated for observation and follow-up; however, malignant lesions such as melanoma also need to be considered and need to be surgically removed as early as possible. If a small mole or multiple small moles grow on the edge of a mole, it is recommended to go to the hospital in time for dermoscopy or pathology examination, which can help determine the malignancy of the mole. For benign proliferation or regular pigmented nevus and the formation of multiple nevi, both can be observed and followed up, without treatment for the time being. If pathological examination shows that the local tissues of the nevus may have malignant tendency or belong to melanoma, it is recommended to undergo surgical excision as early as possible and do postoperative review to avoid spreading and metastasis of malignant tumor cells. When the growth of nevus appears on the surface of the body, it is recommended to go to the hospital for pathological examination, in order to strive for early detection, early diagnosis and early treatment.