Damp-heat underflow can cause perineal soreness to some extent. Damp-heat underflow (Dampness and heat invading the intestines, bladder, pubic area, lower limbs, etc.) is the name of a Chinese medical condition. It refers to the flow of dampness and heat into the lower jiao (usually referring to the bladder and kidneys), and the bladder qi is out of order. The main manifestations are short and red urine (small amount of urine, dark yellow in color), heaviness and fatigue, yellow and greasy tongue coating, and moistened pulse. Symptoms include frequent urination, urinary urgency, painful urination, constriction of the lower abdomen (abdominal tugging and discomfort), and distension of the perineum. It is mostly caused by irregular work and rest and unhealthy diet. Treatment should be based on clearing heat and inducing dampness, and Ermiao Pills or Si Miao Pills can be chosen. Er Miao Wan contains Huang Bai, which is bitter and cold, clearing heat and drying dampness, and is mainly used for treating eczema and wet sores caused by dampness-heat downward injection. Four Miaowan consists of Huangbai, Atractylodes macrocephala, hyssop, and Coix lacryma, which is more effective in clearing heat and relieving dampness. It is used for treating redness and swelling of the shins and feet, and musculoskeletal pain caused by dampness-heat underflow. Pregnant women should be cautious of using it, and people with cold constitution should be cautious of using it. Daily prevention can be achieved by eating a light diet, avoiding oily, cold and spicy foods, and avoiding late nights. If symptoms of dampness-heat injection occur, consult a doctor for treatment. The medication should be used under the guidance of a physician, and should not be taken on its own.