Polymyositis and dermatomyositis are two closely related inflammatory muscle diseases (myopathies) in which muscle fiber inflammation leads to progressive muscle weakness. While polymyositis lacks skin involvement, dermatomyositis is distinguished by its characteristic skin rash. Both are autoimmune conditions that can also affect the lungs, heart, and joints.
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Understand key symptoms, causes, diagnosis options, and treatment pathways for Polymyositis and Dermatomyositis Overview. This overview is intended for patient awareness and should be followed by specialist consultation.
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Combined incidence of approximately 5–10 cases per million per year.
Verified medical information source from NIAMS.
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