Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hidradenocarcinoma ?
    ### Response:
    Hidradenocarcinoma is a tumor caused by the abnormal growth of cells in a sweat gland.  It is a type of cancer that usually begins as a single spot (lesion) on the skin of the head or neck, but it has also been found on other parts of the body.  This type of tumor typically develops in older individuals (after age 40).
    