The redness and swelling of the labia majora is considered to be caused by inflammation of the vulva or friction and allergy. Try to wear loose, cotton underwear, wash your vulva with warm water every day, and keep your vulva clean before and after intercourse. If the vaginal discharge is abnormal, painful, itchy and uncomfortable, it is best to have a gynecological examination of the vagina and a routine laboratory test of the white belt, and use the right medicine for anti-inflammatory treatment, otherwise vaginal inflammation can easily be combined with vulvar infection and lead to redness and swelling of the labia majora, which is also a form of gynecological inflammation. Allergies to chemical fiber clothing can also lead to redness and swelling, and allergies will generally improve on their own when isolated from allergic substances. The allergic condition is usually resolved by isolating the allergic substance. Try to buy quality sanitary napkins during menstruation, as counterfeit products can also lead to vulvar redness and swelling.