A stye is caused by infection of a gland at the base of an eyelash. It generally causes a lump at the margin of the eyelid, that is inflamed and often painful. Styes are usually caused by ...

Yellow or green discharge (pus) in the eye The eyelids are stuck (matted) together with pus after sleep After being wiped away, the pus comes back during the day Often caused by a bacterial eye ...