Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Sarcoidosis ?
    ### Response:
    Sarcoidosis is a disease that leads to inflammation, usually in your lungs, skin, or lymph nodes. It starts as tiny, grain-like lumps, called granulomas. Sarcoidosis can affect any organ in your body.     No one is sure what causes sarcoidosis. It affects men and women of all ages and races.
    