Source: Focus Medica. A small red, painful lump in the edge of the eyelid. Stye is usually caused by bacterial infection. It may be present inside or outside the eyelid on one or both eyes and is ...

A stye (medical term: hordeolum) is a common eye condition characterized by a small, painful lump or bump on the edge of the ...

Here are eight causes of eye swelling: 1. Hordeolum (AKA stye) A hordeolum is the medical term for a very common eye ailment –– a stye. "At the base of the eyelashes are oil glands called ...