A sty is a red, painful lump, often filled with pus, near the edge of the eyelid.
It may look like a boil or pimple. Sometimes a sty can form on the inner part of the eyelid.
In most cases, a sty will begin to disappear on its own in a few days. A warm washcloth applied to the eyelid may relieve pain and discomfort.
Last Updated Jun 13, 2017