Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Multiple familial trichoepithelioma ?
    ### Response:
    Multiple familial trichoepithelioma is a rare condition characterized by multiple smooth, round, firm, skin-colored tumors (trichoepitheliomas) that usually occur on the face, but may also occur on the scalp, neck, and trunk. The tumors are derived from immature hair follicles.
    