If a girl has a pimple on her vulva and it is painful, it is considered to be caused by a vulvar boil, which is an acute inflammation. In this case, there will be localized redness and swelling. It is recommended to apply erythromycin ointment or Bactrim ointment locally for 3-5 days after washing with double ginseng lotion. You can take metronidazole tablets orally, 3 times a day, 1 tablet after meals, for 3 days. At the same time, in the diet to strengthen nutrition, but can not eat spicy and sour stimulating food, mainly based on light. In addition, it is recommended to wear cotton underwear to reduce the pain caused by local friction. If it is not improving after medication, you need to go to the hospital to make an incision so that the pus can flow out, which will relieve the clinical symptoms.