Red, thickened, scaly skin over the knuckles (Gottron sign) associated with dermatomyositis, an autoimmune disease of the skin and muscles.
Review Date 1/10/2019
Updated by: Gordon A. Starkebaum, MD, MACR, ABIM Board Certified in Rheumatology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.