Perineum: There is a distinction between a narrow and a broad sense. The narrow sense of the perineum only refers to the soft tissue between the anus and external genitalia, and the broad sense of the perineum refers to all the soft tissue below the pelvic diaphragm that closes the lower pelvic opening. 1. Perineum in the narrow sense: it refers to the area between the genitals and the anus, connecting the vagina and the anus, excluding the anus, and what is usually called the perineum is the perineum in the narrow sense. 2. Perineum in the broad sense: it can be divided into two areas, one is the urogenital triangle in front, bounded by the pubic bone union, and the other is the anal triangle in the back, bounded by the end of the tailbone. Because of the special physiological position of the perineum, it is not easy to clean, and it is more likely to be infected by inflammation. Therefore, usually should pay attention to the protection, wear loose underwear, keep the perineum clean, dry, ventilated, breathable, avoid sedentary, standing for a long time, is conducive to the prevention of perineal diseases. If there is any discomfort in the perineum, go to the regular hospital for consultation and treatment in time.