If there is a hard lump in the vaginal opening that hurts when you touch it, consider that it may be caused by vulvovaginitis, folliculitis, vestibular cysts and other diseases. 1. Vulvovaginitis: If the vulva is infected by bacteria or viruses, such as bacterial vulvovaginitis and trichomonas vulvovaginitis, and the local tissues are stimulated for a long period of time, a localized hard lump may appear, and it will be painful when rubbed by the clothes or touched in normal times. 2. Folliculitis/vestibular cyst: If there is long-term stimulation of local bacteria, resulting in increased secretion, it is easy to cause blockage of the glandular ducts, resulting in localized hard lumps, which can also be painful to touch. If abnormal vulvar hard lumps occur, it is recommended to seek medical treatment in time for symptomatic treatment.