Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Juvenile dermatomyositis ?
    ### Response:
    Juvenile dermatomyositis has some similarities to adult dermatomyositis and polymyositis. It typically affects children ages 2 to 15 years, with symptoms that include weakness of the muscles close to the trunk of the body, inflammation, edema, muscle pain, fatigue, skin rashes, abdominal pain, fever, and contractures.
    