The main reasons for the bumps on the lower body of women are not specific, but the common causes include: 1. If the bumps are large and occur on the inner side of the labia majora, they are vestibular gland cysts, which are caused by the blockage of the glandular opening of the vestibular gland and the retention of internal secretions that cannot be discharged. 2. If the bumps occur at the hair follicles of the vulva, they are considered to be caused by inflammation of the hair follicles, which is related to poor personal hygiene or local frictional stimulation.