Chalazion and Hordeolum (Stye) By James Garrity, MD, Mayo Clinic College of Medicine and Science Reviewed / Revised May 2022 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Chalazion Hordeolum (External) Chalazia and hordeola (styes) are sudden-onset localized swellings of the eyelid.