The most common causes of pimples are: 1, vulvar folliculitis is the most common, mainly due to local hair follicle inflammation caused by hair follicle blockage, there will be pimples, accompanied by local redness, swelling and pain, you can apply topical symptomatic drugs to alleviate the symptoms. 2, vulvar skin diseases, the most common of which is the vulvar squamous epithelial hyperplasia and vulvar sclerosing tesserae, which can occur. 3, insect bite dermatitis, after the bite of mites or other insects, there will be local skin thinning or thickening, local skin color changes. The most common is squamous epithelial hyperplasia of the vulva and sclerosing moss of the vulva, all may appear the performance of pimples, there will be local thinning or thickening of the skin, local skin color change. 3, insect bite dermatitis of the vulva, the vulva by mites or other insect bites will also appear this kind of symptom, often accompanied by local itchiness. 4, less common is the vulvar tumors, often there will be a block or local ulceration, and so on, need to improve the relevant examination to further clarify.