Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Scleroderma ?
    ### Response:
    Scleroderma means hard skin. It is a group of diseases that cause abnormal growth of connective tissue. Connective tissue is the material inside your body that gives your tissues their shape and helps keep them strong. In scleroderma, the tissue gets hard or thick.
    