If a girl has a pimple on her bottom and feels pain when she touches it, it is likely to be caused by an acute inflammation of the vulva. When the vulva is inflamed and the inflammation is limited, there will be local redness, swelling and pain, often the performance of vulvar boils, it is recommended to give timely anti-inflammatory treatment, you can first wash the local with water, or use skin cleanser, Jieer Yin to wash the local area, and then apply erythromycin ointment or Bactrim to the place where the acne is treated, it is recommended to apply the medicine 2-3 times a day, for about 5 days This symptom will be relieved in the clinic. In addition, girls must keep their vulva clean, wash it with warm water once a day, be sure to change your underwear, it is not recommended to have the habit of using pads, because the pads may cause poor local ventilation and cause the reproduction of pathogenic bacteria, resulting in vulvar inflammation.