Dermatomyositis is “distinguished from autoimmune myopathies and polymyositis by distinct dermatologic findings, including Gottron’s sign (nonpalpable macules over the extensor surface of joints). Patients may also have dilated nail-fold capillaries and ragged, thickened cuticles. ” ABFM critique
Further Reading
Eye of the beholder. N Engl J Med 2016;374(18):1774-1779.