Boils on the vulva are mainly caused by acute inflammation of the vulva. The following conditions can cause local inflammation: 1. Wearing tight pants often reduces local blood circulation and resistance, and once bacteria are present, local inflammatory reactions can easily form, manifesting as local redness, swelling, heat and pain. 2. Not keeping the vulva clean locally, causing local infection of pathogenic bacteria in the vulva, can also cause small boils. It is recommended to keep the vulva clean in daily life, and women are advised not to wear tight-fitting pants.