How do you know if you have a stye?

A stye camera.gif is an infection that causes a tender red lump on the eyelid. Most styes occur along the edge of the eyelid. When a stye occurs inside the eyelid, it is called an internal hordeolum (say “hor-dee-OH-lum”).

A stye usually starts as a red bump that looks like a pimple along the edge of the eyelid.

As the stye grows, the eyelid becomes swollen and painful, and the eye may water.
Most styes swell for about 3 days before they break open and drain.
Styes usually heal in about a week.