Penis purple may be caused by physiological factors, may also be caused by pathological factors, the specific circumstances should be based on the patient’s condition. 1. Physiological factors: patients wearing tight pants for a long time, will cause extrusion of the penis, the symptoms of purple penis. In addition, if men are overly nervous during sex, it will affect the dilatation of the penile arteries, resulting in insufficient blood supply and the symptoms of penile purple. 2. Pathological factors: the patient’s cavernous body of the penis is insufficient blood supply for a long time, the symptoms of purple penis. If the circumcision abnormalities caused by the incarceration, so that the glans venous return is blocked, thus causing the situation of the penis turned purple. Patients who have a purple penis should go to the hospital in time for examination. After identifying the specific cause of the disease, under the guidance of the doctor to choose the appropriate method of treatment, so as not to lead to the aggravation of the condition and the emergence of adverse symptoms.