There are many causes of vulvar fissures, such as vulvar malnutrition, vulvovaginitis, vaginitis, and sexual intercourse. Vulvodynia: When the vulva is inflamed by pathogenic bacteria, it will become swollen, congested and itchy, in which case the patient will scratch, which may lead to vulvar skin fissures. Vaginitis: When the vagina is infected with inflammatory diseases, such as bacterial vaginitis, mycotic vaginitis, non-specific vaginitis, or senile vaginitis, the vagina and vulva will be swollen, congested, and may develop ulcers. If the patient scratches the vulva, the vulvar skin may break. Sexual intercourse: If the intercourse time is too long, the vulva and vagina will be in a state of mutual friction for a long time, which may lead to fissures. Furthermore, if the sexual intercourse is too rough, this phenomenon can also occur. Acute vulvar ulcer: It can also lead to fissures in the vulva. One of the signs of vulvar malnutrition is vulvar fissures. In short, vulvovaginitis or vaginitis can cause vulvar fissures, which should be treated seriously and actively treated for the cause.