Vulvitis is irritation or inflammation of the vulva, the skin outside the vagina. It causes symptoms like itching, redness, swelling, soreness, and pain during sex. Vulvitis can be caused by infections, irritants like soaps or tight clothing, medications, douching, or poor hygiene. Diagnosis involves examining the vulva and testing for infections. Treatment depends on the underlying cause but may include anti-fungal or antibiotic creams, hydrocortisone cream for allergies, or estrogen cream for post-menopausal women. Preventing vulvitis involves keeping the vulva clean, dry, and cool and avoiding irritants.