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.
Review Date 11/4/2020
Updated by: Elika Hoss, MD, Senior Associate Consultant, Mayo Clinic, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.