Vulvar itching and enlargement may be caused by the following reasons: First, if it is simple itching and enlargement, it may be caused by local allergies, such as allergy to sanitary napkins or new underwear, or allergy to certain drugs, and it is recommended that appropriate medication be given according to the clinical history and examination. If the allergy is anti-allergy, such as applying mometasone or paresone, will make the local itching symptoms significantly reduce, and with the passage of time the phenomenon of swelling will also be significantly reduced. Secondly, if accompanied by increased vaginal discharge, often due to vaginal inflammation, such as candida vaginitis, trichomonas vaginitis, will not only lead to the vaginal mucosa red, swollen, hot, painful and other inflammatory reactions, but also cause allergic phenomena, which will lead to local itching, as long as the targeted use of medication, the symptoms will be relieved soon.