A stye is a relatively common infection. Styes are often caused by staphylococcus and occur in the glands that open onto the lid margin. They are red, swollen, and painful.
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.