Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Vulvar Cancer ?
    ### Response:
    Vulvar cancer is a rare type of cancer. It forms in a woman's external genitals, called the vulva. The cancer usually grows slowly over several years. First, precancerous cells grow on vulvar skin. This is called vulvar intraepithelial neoplasia (VIN), or dysplasia.
    