There are many causes of vulvar itchy skin redness and swelling, such as allergy, vulvar eczema, various types of vulvovaginal inflammation, genital herpes, warts and other causes. 1. Allergy, vulvar eczema: During menstruation, allergy to sanitary napkins and sanitary pads leads to redness and itching of the vulva, or due to gynecological inflammation leads to increase in leukorrhea, which causes prolonged stimulation causing vulvar eczema and so on, leading to vulvar itchiness, redness, swelling, pain and other symptoms. 2. Various types of vulvovaginal inflammation: for example, bacterial vaginosis, trichomonas vaginitis, vulvovaginal pseudomycosis, senile vaginitis, diabetic vaginitis and so on, all of which may lead to vulvovaginal itching, redness, swelling, pain and other symptoms. 3. Genital herpes: due to the infection of genital herpes virus, may also produce vulvar itching, pain and other symptoms, local blisters, 2 to 4 days after the rupture of the formation of vesicles or ulcers, redness of the skin. 4. warts: belonging to the human papilloma virus caused by sexually transmitted diseases, the beginning of the vulva red itching, there is a small red rash, with the increase in time, the red rash grows to become a corns, cauliflower-like superfluous organisms. There are many other causes of vulvar itching skin redness and swelling, it is recommended to go to the hospital in time to improve the relevant examination, under the guidance of the doctor to clarify the cause of the disease, targeted treatment.