Vulvovaginitis is an inflammation or infection of the vulva and vagina. It’s a common condition that affects women and girls of all ages, and it has a variety of causes.Other names for this condition are vulvitis and vaginitis.he sexually transmitted infection (STI) trichomonas vaginitis can also cause vulvovaginitis. This causes genital discomfort, itching, and heavy discharge. This discharge can be yellow, green, or gray. It often has a strong odor.