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 ...

Other stye symptoms include: Eyelid swelling Eyelid ... sensation of having something in the eye How to treat it: The main treatment is simple and DIY. Simply apply a warm compress to the area ...