The itchy edge of one side of the vulvar lips may be an infection of bacteria and other microorganisms in this area, which can be diagnosed by a doctor and then applied to the affected area using potassium permanganate lotion and metronidazole ointment under the doctor’s guidance. When a woman’s vulva is infected, you can wash the vulva before bedtime, use potassium permanganate lotion, metronidazole ointment and other medications for treatment, mainly used for the skin to stop itching, during the use of medication should pay attention to avoid sexual intercourse. The medication may cause transient mild pain or peeling of the skin. Note that the people who have allergic reactions to these drugs and ingredients are prohibited to avoid adverse consequences. Itchy edge of one side of the labia externa may also be the cause of local malnutrition, etc. Symptoms should be timely medical attention, and use the medication under the guidance of the doctor, so as to ensure that the drug is more effective.