The penis is the male external genital organ, and the male urethra is also located in the penis, so the penis has an important role. The scrotum is a skin sac, located behind the penis,thin and soft, with a middle partition dividing the scrotum into two chambers, left and right, each containing the testicles, epididymis, and vas deferens. Scrotal edema will be swollen in appearance, or one side of the scrotum is larger than the other, inconvenient and easily injured, sometimes combined with swelling and pain, and even affect the blood circulation of the testicles due to excessive water accumulation, which will cause testicular atrophy over time and affect the ability of the testicles to produce sperm in the future, resulting in infertility. The reason: penile edema: masturbation, excessive roughness and frequency during sex, penile spongiitis, etc. can lead to obstruction of blood flow back to the penis, causing penile edema. Scrotal edema can be divided into congenital and acquired: congenital scrotal edema: occurs in newborn infants, because after the testicles descend to the scrotum, the sheath of the letter between the abdominal cavity and the scrotum is not completely closed, so that the abdominal water flows into the scrotum, surrounding the testicles and forming congenital scrotal edema. Acquired scrotal edema: It occurs mostly in adults. Local trauma, impact on the scrotum, radiation treatment of the scrotum testis, acute and chronic inflammation of the parascutum, invasion of the testis by tuberculosis and the parascutum can all lead to scrotal edema. In 10% of cases, testicular tumors first appear as scrotal edema.