There are several reasons for small bumps on the labia: First, it may be due to gynecological inflammation, such as common pelvic inflammatory disease, endometritis, vaginitis and labia, especially labia and endometritis, which are the most important and common causes of small bumps on the labia. The secreted substances of inflammation and the necrosis and shedding of cells caused by inflammation can accumulate on the surface of the labia to form small bumps. If the inflammation is more serious, it may also cause ulceration, erosion and defect of the skin on the surface of the labia, when there will be proliferation of granulation tissue to form scarring, which can also grow small bumps. Second, to consider sexually transmitted diseases, for women who have a sexual life and have multiple sexual partners, the possibility of suffering from sexually transmitted diseases is very high, such as condyloma acuminata, syphilis, AIDS, genital herpes, etc. These viruses can also have abnormal secretion substances, which can also cause cell proliferation, necrosis and shedding, and can also destroy the integrity of the local tissue mucosa, all of which can lead to small bumps on the surface of the labia.