Local swelling of the labia may be caused by the following reasons: 1. Local mucosal inflammation causes local congestion and edema, so swelling will be felt. You can actively give anti-inflammatory treatment by applying Bactrim or erythromycin ointment locally for treatment. If vaginal discharge increases, it may be due to local inflammation of the vagina, resulting in inflammatory reaction of the labia. 2. Swelling caused by allergy to certain drugs or allergy to sanitary napkins or underwear, and often accompanied by local itching of the labia. If necessary, local anti-allergy treatment can be given, such as applying mometasone ointment, which will improve the symptoms.