A stye (medical term: hordeolum) is a common eye condition characterized by a ... Forms on the outer part of the eyelid and resembles a pimple. * Internal Stye: Develops inside the eyelid and ...

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 ...