Pathologic examination should be performed first after a mole on the head grows larger. If it is benign proliferative tissue then conservative observation can be considered. If there is a tendency of malignant lesions, then surgical excision should be carried out immediately. It is recommended to go to the hospital for pathologic examination after the symptoms of growing or accelerated growth of nevus on the head. Tissue biopsy of the lesion can directly observe whether the tissue has malignant tendency. If the nevus is benign, it can be observed conservatively. If the nevus is found to have malignant tendency or early cancerous symptoms during the pathological examination, it is recommended to undergo surgical excision as soon as possible. In case of abnormal growth or accelerated growth of nevus on the body surface, it should be recommended to carry out pathological examination in time and choose the appropriate treatment plan under the guidance of doctors.