A chalazion and a hordeolum are both bumps on the eyelid. A hordeolum, also called a stye, is caused by bacterial infection, while a chalazion results from an obstructed gland. Knowing whether you ...

Bacteria can be the underlying cause of both blepharitis and styes. But styes are the result of an infection and cause a painful lump, while blepharitis is eyelid inflammation. If your eye is ...