If the vulva is itchy and swollen, the most common cause is acute inflammation of the vulva due to bacterial infection, and most of the time it is a vulvar boil. In this case, if you feel the boils with your hands, there is obvious tenderness, and the local inflammatory reaction such as redness and swelling will appear, you can wash the local area with 30% of Gelatin, and apply Bactrim and erythromycin ointment locally for treatment. If there is pus, it is recommended to take oral broad-spectrum antibiotics and keep the local clean, wash the area 1-2 times a day with Steroid, then apply erythromycin and Bactrim, 3-4 times a day. Wear loose-fitting underwear, keep the local area well ventilated and avoid friction. In terms of diet, do not eat sour, spicy and stimulating food.