What are the symptoms of male genital problems?

Male genital problems may cause a variety of symptoms, depending on the cause. Symptoms of injuries are usually severe, short-lived pain that go away quickly. Infections may cause pain, swelling, and abnormal discharge from the penis. Other symptoms may include rashes, sores, and itching, especially if the problem is caused by a sexually-transmitted disease. Some male genital problems may lead to symptoms such as a persistent erection or the inability to keep an erection.