It can be divided into infectious and non-infectious causes. Infectious causes include: 1. Herpes simplex virus infection caused by herpes breaking down and forming a trauma in the vulva area, local tissues are infected and ulcers are formed. The vulvar ulcers caused by vulvar tuberculosis, in which mycobacterium tuberculosis destroys the muscle tissue of the vulva to form ulcers, accompanied by low fever, night sweats, wasting and other cachexia. 2. Mycobacterial vaginitis secretions stimulate the vulva causing itching, and women scratching causes ulcers caused by skin rupture. 3. Syphilis in the third stage is mainly manifested by damage to the mucous membrane of the vulvar skin, which can also cause vulvar ulcers. 4. Non-infectious factors, commonly The vulvar ulcers are caused by trauma to the vulva, resulting in local skin breakage and improper care at a later stage. 5. In the early stage of vulvar cancer, recurrent ulcers can appear on the lesion, which can gradually erode to the deeper layers of the skin or blood vessels and cause hemorrhage.