A coitus vulvar ulcers may be vulvar inflammation, estrogen deficiency, sexually transmitted diseases and other causes, need to be analyzed specifically. 1. Vulvar inflammation: if women have vulvar inflammation, the local skin is more fragile, under the stimulation of sexual life, it may cause vulvar ulcers. 2. Estrogen deficiency: for women with estrogen deficiency, the vulvar skin is easy to become congested and swollen, secretions may be reduced, and skin breakage may occur under the stimulation of sexual life. 3. Sexually transmitted diseases: If there are sexually transmitted diseases, such as syphilis, gonorrhea, etc., the vulva may be pathologically altered and ulcers may appear when stimulated by sex. There may be other reasons for ulcers on the vulva after intercourse, so it is recommended to go to the hospital in time for medical examination, to clarify the cause of the disease under the guidance of professional doctors, and to carry out targeted treatment.