B&A lotion can wash inside. It is a drug for external use and can be used to flush the vagina. When flushing the vagina, it needs to be diluted with warm water. The drug needs to stop using after a period of time and go to the hospital to check the leucorrhea routine after the next menstrual period is clean. The main efficacy of Baian lotion is to clear away heat, detoxify, dry and damp, and stop bleeding. At present, it is commonly used in the treatment of vulva pruritus, vulva burning sensation, short urination, yellowing and vulva tingling caused by fungal vaginitis, bacterial vaginitis or trichomonal vaginitis. Secondly, it has therapeutic effect on bitter mouth, dry throat, red tongue coating and other symptoms.