Encyclopedia Home / D / Dermatomyositis


  • Symptoms
    • Difficulty swallowing
    • Muscle weakness, stiffness, or soreness
    • Purple or violet colored upper eyelids
    • Purple-red skin rash
    • Shortness of breath

    The muscle weakness may appear suddenly or develop slowly over weeks or months. You may have difficulty raising your arms over your head, rising from a sitting position, and climbing stairs.

    The rash may appear over the face, knuckles, neck, shoulders, upper chest, and back.

    Signs and tests

    The doctor will perform a physical exam. Tests may include:

    • Bloods test to check levels of creatine phosphokinase and aldolase
    • ECG
    • Electromyography
    • Magnetic resonance imaging (MRI)
    • Muscle biopsy