Men’s bottom old sweat is also refers to men’s perineum sweat, the cause is mainly related to the scrotum eczema, chronic prostatitis, as well as varicose veins and other diseases, but also may be seen in some physiological factors. 1. Scrotal eczema is a chronic inflammatory skin disease, with a variety of internal and external factors related to stimulation, in the clinical mainly manifested in the scrotum moisture. 2. Chronic prostatitis as a common urological disease, due to prolonged inflammatory stimulation leading to prostate congestion, in the clinic is also prone to scrotum as well as perineal area skin sweating phenomenon. 3. Varicose veins will affect the local blood circulation, in addition to the clinical manifestation of scrotal swelling, there will also be excessive sweating and dampness. 4. Physiological factors caused by the scrotum area sweating more with the high temperature of the environment, clothing too thick, as well as exercise and other factors. To summarize, there are more causes of sweating in the lower part of a man’s body, and it is necessary to ask the doctor to conduct an interview for specific cases.