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 ...

The primary causes of a chalazion are obstruction of the oil glands (meibomian glands ... Blepharitis does not cause a lump on the eyelid. However, blepharitis can increase your risk of getting ...

Meibomian gland dysfunction (MGD ... in MGD based on more recent findings from mouse models. In these studies, eyelids from normal young and old mice or mice exposed to desiccating stress were ...

Medically reviewed by Johnstone M. Kim, MD Swollen eyelids, top or bottom, can have many causes, including allergies, infections, and blocked oil glands. While most aren't serious, eyelids can also ...