Dermatoniyositis and polymyositis

Dermatomyositis (DM) and polymyositis (PM) are idiopathic inflammatory myopathies. The major manifestation of the myositis is proximal muscle weakness. Thirty percent to 40% of adults and 95% of children have cutaneous manifestations (DM) that include: (1) Gottron's papules; (2) the heliotrope suffusion around the eyes, associated with periorbital edema; (3) poikiloderma, often photosensitive; and (4) nailfold changes including erythema,...