A girl with a pimple on her labia externa is considered to be caused by boils, vestibular cysts, warts and so on. 1. boils: mainly local bacterial infection caused by a skin disease, often appear as a single nodule, early manifestation of redness, swelling and pain, and then gradually increase in size and the formation of abscesses, and ultimately can be broken. 2. Vestibular gland cysts: most of them are caused by injury or chronic inflammation, which can lead to obstruction of the opening of the vestibular gland ducts, and a large amount of secretion retention and rapid formation of cysts, small cysts usually have no obvious symptoms, and large cysts may lead to vulvar swelling. 3. warts: mainly infected with human papillomavirus caused by a sexually transmitted disease, can be manifested in the perineum in the white small papillary warts, and then the lesions increase may be manifested as cauliflower-shaped or corns. The girl has a pimple on the lips of the vulva may be caused by other reasons, such as viral herpes, local skin allergies, etc. It is recommended to go to the hospital in time to find out the cause of the targeted treatment.