A chalazion is a swollen, pain-free lump on the eyelid. It gradually forms when the meibomian gland, a sebaceous (oil) gland, is blocked. A chalazion is sometimes called an eyelid cyst or a ...

A pimple on your eyelid usually isn't acne — it's probably a stye, chalazion, or xanthelasma. A stye is a round, red bump that can be treated with a warm compress to drain the pus. A chalazion ...

A stye is a red, hot, very tender swollen bump near the edge of your eyelid. A chalazion, on the other hand, is a somewhat tender, smooth, round bump normally in the middle of your eyelid.