When redness appears in ring shapes on the body, it is referred to as erythema annulare, shown here on the forearm. There are generally no symptoms, with the exception of mild itching (pruritus). It may be associated with serious diseases, but in the majority of cases, an underlying illness is never discovered.
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.