Well defined (like a nodule) to diffuse swelling visible on the eyelid, with or without pain/tenderness and redness in the region. There may be associated blepharitis or acne rosacea.

What is it?

A blocked meibomian gland with collected secretions and super-added infection.

Image taken from the Internet

Treatment

Warm compresses 4-5 times a day for 10-15 minutes, with massage over the swelling.
A combination of antibiotic-steroid ointment may be applied 3 times over the swelling.
Surgical incission and curratage is indicated when the swelling has remained for more than 4 weeks and the patient wants it removed. Alterately a local injection of steroids into the swelling sometimes reduces the swelling.