The woman’s bottom outside a pimple to consider for warts, folliculitis, hemorrhoids, allergies, eczema and other diseases caused by. 1. warts: mainly human papilloma virus infection formation, belongs to the sexually transmitted diseases, usually cauliflower-like or papilloma-like, mostly in the genitals and anal area, which caused the woman below the outside of the pimples of the symptoms. 2. Folliculitis: mainly bacterial infection caused by the inflammatory reaction, you can see a single or multiple rashes below, can also cause the symptoms of the woman below the outside of the growth of a pimple. 3. hemorrhoids: if the pimples are located in the anus, this situation is considered hemorrhoids, hemorrhoids are divided into internal hemorrhoids, external hemorrhoids, mixed hemorrhoids, can also cause the woman below the outer side of the growth of a pimple. 4. allergy: if the vulva contact allergens, can cause local skin allergies, can be manifested as the symptoms. 5. Eczema: If the vulva is in a moist and warm environment for a long time, eczema can be induced, which can also be manifested as the symptom. In addition, there are many other causes for a woman to have a lump on the outside of her bottom, and the patient should go to the hospital in time to clarify the specific cause of the disease.