The swelling of vulva with local pain is mostly caused by inflammation, so you can apply erythromycin ointment and give anti-inflammatory treatment accordingly. The swelling of vulva accompanied by severe local itching may be caused by allergy. If the clinical symptoms are not relieved for 3 days after the above mentioned medication, it is recommended to go to the hospital for further examination to exclude the possibility of other diseases, such as vulvar tumor or other lesions causing swelling, and then give treatment.