If the patient finds that the glans is a little black and purple is a normal situation, not serious, do not need to worry too much. Because the male patient’s penis is rich in blood supply, it may lead to the appearance of the glans black purple, when the penis erection black purple situation will be more obvious, this is normal. If there is a black and purple glans with pain, it may be due to poor venous blood flow in the penis, which is a more serious situation. It is advisable to go to the hospital in time for relevant examinations. It may be due to frequent masturbation or frequent sexual intercourse that leads to damage to the penile veins, which can cause poor venous blood flow, resulting in blood pooling in the glans causing black and purple glans and pain, and in serious cases, penile necrosis, which must be actively treated.