If there are bumps on the pubic area that are hard and painless, often on the left or right side of the posterior vaginal union, they are often caused by cysts of the vestibular gland. This is mainly due to chronic inflammation of the vulva or vagina in the past, which can cause the opening of the vestibular gland to become blocked and the vestibular fluid cannot be discharged, so it accumulates in the cystic cavity and forms a cyst. If there is a combination of infection, there will be severe local pain, local redness and swelling, and even local pus. Therefore, it is important to keep the vulva clean and pay particular attention during menstruation when having sex, so that pus does not form and pain does not develop only if infection is avoided. If the bumps are large, they can be treated surgically.