OverviewRed, thickened, scaly skin over the knuckles (Gottron's sign) associated with dermatomyositis, an autoimmune disease of the skin and muscles.
Update Date 1/20/2015
Updated by: Gordon A. Starkebaum, MD, professor of medicine, division of rheumatology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.