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Polymyositis and Dermatomyositis%u2022 Inflammatory myopathy causing proximal muscle weakness%u2022 Key autoantibody: Anti-Jo1Polymyositis:%u2022 Similar to polymyositis with additional skin manifestations%u2022 Characteristic skin findings:%u2022 Heliotrope rash (periorbital purple discoloration)%u2022 Gottron's papules (over knuckles and joints)%u2022 Shawl sign (rash over upper back and shoulders)Dermatomyositis:%u2022 Elevated creatine kinase, EMG, muscle biopsyInvestigations:%u2022 Corticosteroids, immunosuppressantsTreatment:This Photo by Unknown Author is licensed under CC BY
