Dermatomyositis (dur-muh-toe-my-uh-SY-tis) is a rare acquired immune-mediated muscle disease characterized by muscle weakness and skin rash. It is classified as one of the idiopathic inflammatory myopathies (IIM). Although all idiopathic (unknown cause) inflammatory myopathies share the same pattern of muscle weakness, they differ clinically in terms of muscle groups involved and histopathological (study of tissues) […]