Skin moles may be related to genetic factors, bad habits, abnormal nerve regulation and other reasons. 1. Genetic factors: It may be that during embryonic development, melanocytes stay in the dermis as they move from the neural crest to the epidermis, leading to the creation of moles. During the process of slow growth, the moles on the skin will gradually become bigger and thus more obvious. 2. Bad life habits: If patients stay up late and eat spicy and stimulating food for a long time, it will lead to hormone metabolism disorder, and melanin accumulation will lead to skin moles. 3. Abnormal nerve regulation: when the nerve regulation is abnormal, it will also affect the number of moles. If the patient is anxious or too tense for a long time, it will cause the pituitary gland to secrete some special substances, which will be deposited on the skin, and in the long run, moles or pigmented spots will be formed. If the mole grows faster, it is recommended to go to the hospital to do pathological examination to clarify the cause of the disease, and then correctly treat it under the guidance of the doctor.