Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Lichen sclerosus ?
    ### Response:
    Lichen sclerosus is a chronic skin disorder that is more common in women, most often affecting the external part of the vagina (vulva) or the area around the anus. In men, it typically affects the tip of the penis. It can occur at any age but is usually seen in women over age 50.
    