Dermatomyositis and polymyositis

Dermatomyositis (DM) and polymyositis (PM) are currently considered to belong to the category of autoimmune diseases. DM shows diffuse inflammation of the skin and muscles, erythema and edema appear on the skin, muscles show weakness, pain, and swelling, which can be accompanied by joint pain and multiple organ damage such as lungs and heart muscle; PM has no skin damage.

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