During human growth and development, the male testicles gradually descend into the scrotum, a physiological process that is designed to ensure that the temperature of the testicles remains below the body cavity temperature and can be maintained at a constant temperature range, which is conducive to sperm production in the testicles. When men find that the scrotum in the testicular area is flaccid, it is mainly because the local temperature in the perineal area is high, and the scrotum needs to dissipate heat by stretching to keep the local temperature of the testes in a good and stable temperature range, thus facilitating the normal physiological functions of the testes, such as spermatogenesis and androgen secretion by the testes. If the testicular local wrinkling phenomenon is mainly due to the decrease in external temperature, the scrotum needs to contract to prevent a large loss of temperature inside the testicle and the change in temperature decline caused by the decline in testicular function, so the testicular local flaccidity is a normal physiological phenomenon, if the patient does not have obvious symptoms of discomfort generally do not need to worry about special. For patients with frequent testicular flaccidity and localized hidden pain or varicose veins on the surface of the scrotum, it is recommended to check the ultrasound of the scrotum to clarify whether varicose veins may be present.