Sties are acute pus-filled infections of one or more of the eye glands and are normally located near the eyelashes.

Initial symptoms include pain and redness, followed by a small, swollen, roundish area on the margin of the eyelid. A small yellowish spot in the center indicates pus. When the abscess breaks open and the pus is discharged, the pain is relieved. Swelling can occur around the whole area.

Caution: Do not attempt to squeeze the lump with your fingers, as this may spread the infection into the bloodstream and can become extremely serious.

Usually caused by Staphylococci bacteria and more common in children.