What is a Chalazion and a Hordeolum?

What is a Chalazion and a Hordeolum?

Chalazions Many of us experience, or at least have heard of, a stye. Styes are painful little red bumps of the eyelid. But what are these? Do they carry any serious risk of long-term harm?   Hordeolums The official medical name for a stye is a hordeolum. Within...