Scrotal shrinkage may be caused by physiological factors, damaged scrotum, cryptorchidism and so on. 1. Physiological factors: the scrotum can improve the temperature inside the scrotum and protect the testicles through the automatic regulation of the size. When the weather becomes cold and the temperature is relatively low, the skin of the scrotum shrinks; in addition, if you are mentally nervous, it may also lead to the shrinking of the scrotum. 2. Damaged scrotum: The scrotal tissues are damaged due to impact, stabbing and other trauma. During the healing period of the trauma, the local tissues harden and scarring can be formed, which can lead to scrotal shrinkage. 3. Cryptorchidism: Cryptorchidism is a congenital developmental abnormality. It is a condition in which the testicles do not descend into the scrotum as they normally do during development, and the scrotum shrinks because there are no testicles in the scrotum. Scrotal shrinkage may also be caused by other reasons, it is recommended that patients go to the hospital in a timely manner, under the guidance of the doctor standardized treatment.