If there is a large hard bag on the labia majora, it is mostly considered to be caused by vestibular gland cysts. This is mainly due to long-term inflammation of the vulva, which blocks the ducts of the vestibular glands, and the fluid in the vestibular glands has no way to flow out, and a cyst is formed over time. Cysts are painless when they are not infected, but once they are infected, they can cause severe pain. In the case of vestibular cysts, they can be treated surgically, and the commonly used procedure is open surgery, and they will not recur. If once the infection is combined, in addition to antibiotics, pus is present, it can be incised and drained, and you have to go to the hospital to change the medicine once a day, it will ensure that there is no more infection and the infection will not spread.