Swelling of the vaginal opening can be caused by a number of factors. 1. When there is vaginal inflammation, vaginal discharge can irritate the vulva opening for a long time, causing swelling and redness, and some women may experience itching. 2. In this case, it is necessary to check the vaginal discharge to rule out which kind of vaginal inflammation is present, and then vaginal plugs can be administered according to the situation. 2. Frequent stimulation during intercourse damages the mucous membrane of the vagina and can cause swelling of the vaginal opening. If possible, you should go to a pharmacy and buy a lotion, such as gynecare or cleansing lotion, and take a 15-minute sitz bath in a tub of 1:10 water for 5-7 days to observe the effect. 3. The vaginal opening may be swollen due to the imbalance of the vaginal flora caused by eating foods that are on fire.