The appearance of purple (violaceous) plaques on the knees may be
associated with dermatomyositis. Skin lesions associated with most
other diseases are typically red (erythematous).
Review Date: 03/10/2011
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine,
Harvard Medical School; Physician, Massachusetts General Hospital.
A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)
