Vulvar ulcers are skin mucous membranes of women’s vulva that break down under the infection of bacteria, viruses, etc., or due to syphilis, venereal lymphogranuloma and cancer. The main causes of vulvar ulcers are: 1. vulvovaginitis, such as bacterial vulvovaginitis, mycotic vulvovaginitis, non-specific vulvovaginitis, etc. Under normal circumstances, the vagina has normal secretions and a certain acid-base balance, which inhibits the activity, reproduction and upward movement of pathogenic bacteria, so it is usually not prone to inflammation. However, when the pH of the vagina changes, or when pathogenic bacteria invade the vagina, it can cause an inflammatory reaction. Vulvodynia is mainly an inflammation of the vulva caused by pathogens invading the vulva or by various adverse stimuli to the vulva. Its main clinical manifestations are itching, pain, burning sensation and even swelling, red rash, erosion and ulceration of the vulvar skin. 2. Sexually transmitted diseases. For example, syphilis, AIDS, gonorrhea, condyloma acuminatum, genital herpes, etc. These diseases are mainly transmitted through sexual intercourse and can lead to vulvar ulcers when the disease is present. In conclusion, vulvar ulcers are mainly caused by vulvovaginitis, but syphilis, gonorrhea, diabetes, etc. can cause vulvar ulcers, so when you find vulvar ulcers, you must clarify the cause as soon as possible and receive the correct symptomatic treatment.