Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Apocrine carcinoma ?
    ### Response:
    Apocrine carcinoma is a cancer of a sweat gland.  Apocrine carcionoma most often develops under the arm (the axilla), but it can develop on the scalp or other parts of the body.  The cause of apocrine carcinoma is unknown.  Apocrine carcinoma usually appears as a single, small, painless bump (nodule) that can vary in color and slowly increases in size.
    