If you have a history of unclean sex, a small bump on the vaginal opening is considered a condyloma acuminata, it is best to go to a regular hospital to do the vinegar white test, condyloma acuminata is caused by HPV virus infection, after the diagnosis can be antiviral treatment, but also laser excision treatment. It may also be syphilis, you need to take a blood test for syphilis antibodies, and then decide how to treat it. If there are small bumps in the vaginal opening with localized itching and increased leucorrhea, without a history of unclean sex, it may be caused by inflammatory irritation, such as vulvodynia or vaginitis, which can be treated with lotion or sitz bath or vaginal medication. Tumors of the vulva may also appear on the surface of the vulva as small bumps. If they are painful to touch, they may be related to folliculitis or boils, and erythromycin ointment should be applied locally.