sty definition eye
A sty is a red, painful lump near the edge of your eyelid that may look like a boil or a pimple. Sties are often filled with pus. A sty usually forms on the outside of your eyelid.But sometimes it can form on the inner part of your eyelid. In most cases, a sty will begin to disappear on its own in a couple days. In the meantime, you may be able to relieve the pain or discomfort of a sty by applying a warm washcloth to your eyelid. sty usually forms on the outside of your eyelid. But sometimes it can form on the inner part of your eyelid. In most cases, a sty will begin to disappear on its own in a couple days.