Suspect myopathy? Take this approach to the work-up

inclusion body myositis and polymyositis. The typical rash of dermatomyositis is a he-liotrope (blue-purple) discoloration on the upper eyelids and a raised, violaceous, scaly eruption on the knuckles (Gottron’s papules). Laboratory tests that can be helpful in-clude CK, lactate dehydrogenase (LDH), al- ................
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