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Polymyositis, categorized as an inflammatory myopathy, is an autoimmune tissue disorder of skeletal muscle that involves infiltration of mononuclear cells around nonneurotic myofibers in skeletal muscle and the degeneration, necrosis, and regeneration of myofibers. 1 , 2 Polymyositis causes slow muscle weakness that mainly affects the trunk, proximal limb, neck, and pharyngeal muscles. 1 , 2 In addition to the symptoms of polymyositis, dermatomyositis is diagnosed when it is accompanied by characteristic skin rash, such as a heliotrope rash or Gottron sign or