Vulvar cancer is a type of malignant tumor that develops on the external part of a woman's genitalia. The cancer usually grows slowly and the symptoms are often not seen during the early stages. In most cases, pre cancerous cells develop on the vulvar skin, which is called vulvar intraepithelial neoplasia (VIN). The common symptoms include lump in the vulva, changes in the vulvar skin color, abnormal bleeding and vulvar itching. Forms of treatment include surgery, radiation, chemotherapy and biological therapy.