Black spots on the head of the penis may be caused by excessive cleaning, melanin deposition, circumcision and glansitis, blood circulation disorders and so on. 1. Excessive cleaning: the surface of the glans has a thin layer of mucous membrane, if the long-term use of soap or detergent cleaning, easy to lead to local skin weakness, bruising, resulting in the emergence of patients with black spots on the head of the penis. 2. Melanin deposition: generally seen in the penile skin, the inner plate of the foreskin and the surface of the glans, the color is black, patchy, mainly due to melanin deposition, usually the surface is relatively smooth, without any symptoms. 3. Foreskin glansitis: due to inflammation stimulation will lead to color changes of the glans, resulting in the formation of black spots, when the foreskin is turned out, there is congestion, swelling, and accompanied by symptoms of itching. 4. Blood circulation disorders: If sexual life is too frequent or violent, it will lead to damage to the penile skin and blood circulation disorders, accompanied by pain, swelling and other symptoms. It is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s condition, to take targeted treatment, life should be kept clean, dry, and appropriate enhancement of physical exercise, which helps to enhance physical fitness and promote the recovery of the disease.