Moles on the head may be related to nevus sebaceous, nevus pigmentosus, common warts and other reasons. 1. Nevus sebaceous gland: it is a misconfigured tumor formed by abnormal development of epidermis, dermis and epidermal appendages, etc. After the development of sebaceous glands in puberty, the skin lesions will be thickened to become wart-like or nodular, forming the phenomenon of nevus on head. 2. Nevus pigmentosus: a benign growth formed by melanocytes, which can appear on the head, manifesting itself as a round or similarly rounded pimple, and the phenomenon of a nevus on the head. 3. common warts: due to human papilloma virus infection caused by skin warts, manifested as brown or skin color bulging skin redundancy, surface roughness, hard texture, usually no self-conscious symptoms, occasional pain, the phenomenon of head long meat mole. The mole on the head may also be caused by other diseases, it is recommended that the patient to go to the hospital in a timely manner, a clear diagnosis under the guidance of the doctor standardized treatment.