During the menstrual period, washing the bad dew usually can be done by washing the vulva with warm boiled water, and sitz bath and vaginal douche are prohibited. Bad dew refers to some secretions discharged from the uterus after childbirth, mainly including blood, mucus and necrotic meconium tissue. According to the color and nature of the discharge, it can be divided into three types: bloody discharge, plasma discharge and white discharge. Usually, the bad dew will be discharged out of the body on its own, so washing the bad dew during menstruation, washing the vulva with warm boiled water can be, and prohibit sitz baths and vaginal douching. If there is a cut or wound on the perineum, you can wash the vulva with lukewarm water under the guidance of your doctor. When there is abnormal discharge, such as increased discharge, increased bleeding, odor, prolonged discharge, or accompanied by fever, abdominal pain and other discomforts, you need to go to the hospital to identify the cause of the disease and treatment, such as the timely use of uterine contraction agent to promote uterine contraction, or antibiotics to control infections and other treatments. The menstruation cleaning bad dew, it is recommended to use the correct method of cleaning under the guidance of the physician, to avoid adverse situations.