OverviewRed, thickened, scaly skin over the knuckles (Gottron sign) associated with dermatomyositis, an autoimmune disease of the skin and muscles.
Review Date 2/8/2017
Updated by: Gordon A. Starkebaum, MD, Professor of Medicine, Division of Rheumatology, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.