
08/26/2025
A chalazion is a lump or cyst that forms on the eyelid from a blocked oil gland. This blockage can cause oil and other debris to build up, causing the gland to swell and form a bump on the eyelid. Chalazia are often confused with styes because they both involve swelling of glands in the eyelids, but they have some distinct differences.
Is your eyelid bump a stye or a chalazion? Chalazia are usually harmless and painless but not pretty to look at. Learn the causes and how to treat them.