The scrotum is a container for the testicles and the epididymal tissue. The scrotal skin is contractile and can stretch or contract with changes in temperature. There is nothing wrong with the size of the scrotum, the main concern is the size of the testicles inside. Generally speaking, the testicles are immature before puberty, after puberty the testicular development basically stops, the normal volume is around 16~25ml, with the increasing age, the testicles will gradually shrink and become smaller in men after 60 years old. If the testicles are particularly small, consider that there may be testicular dysplasia, you need to go to the hospital to check whether there is a small testicle situation, this situation can easily lead to poor sperm quality, leading to sexual hypogonadism and less sperm without sperm, which may lead to infertility, you should go to the hospital for timely treatment. However, if the comparison reveals that one testicle is slightly smaller, this situation is still relatively normal, there is one testicle on each side of the human body, and the testicles on both sides are not the usual size, there will be a slight deviation, if you are under more pressure, you can consider going to the hospital to do scrotal ultrasound, to be able to find out the problems of the testicles on both sides. In conclusion, the size of the scrotum can change due to the scrotal skin, but the size of the testicles generally rarely changes. If it is obvious that the testicles feel small, it is still recommended to seek medical examination in time.