Neck darker than the face is usually related to physiological factors such as sun exposure, and may also be related to pathological factors such as acanthosis nigricans, which is usually treated with general therapy, medication, and so on. 1. Physiological factors: the neck is darker than the face may be due to long-term sun exposure, or exposure to strong ultraviolet rays, melanin deposition caused by the neck darkening. Suggest going out with an umbrella, usually pay attention to applying sunscreen and so on. 2. Pathological factors: common diseases such as acanthosis nigricans, which is often manifested as deepening of skin color, velvety thickening, papillary protrusions, so the patient can appear for the neck than the face of the situation of black. Acanthosis nigricans is genetically related, and can be triggered by obesity, malignant tumors, and diabetes. If it is caused by obesity, it is necessary to control diet and reduce weight; if combined with tumors or diabetes and other diseases, it is necessary to actively treat the primary disease; at the same time, under the guidance of the doctor, oral vitamin A, topical retinoic acid cream, hydroquinone cream and other medications to carry out treatment. If the neck is darker than the face, after excluding physiological factors, it is recommended to go to the regular hospital as soon as possible for a clear diagnosis and targeted treatment, the use of drugs need to be applied under the guidance of a doctor.