Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Fibrous dysplasia ?
    ### Response:
    What are the symptoms of fibrous dysplasia? Fibrous dysplasia may cause no symptoms, mild symptoms, or severe symptoms. The most common symptoms are bone pain, bone deformities, fractures, and skin pigmentation differences (light brown spots on the skin). The problems that a person experiences depend on the specific bone(s) affected.
    