A chalazion, also known as a meibomian cyst, is a common condition affecting the eyelid. The fluid-filled swelling (cyst) is usually felt as a small lump. Occasionally, it can become infected. It is caused by blockage of a gland in the eyelid. If it is causing problems and does not settle on its own, it can be removed with a small operation.
The operation is done under local anaesthetic. The eyelid is numbed. A small cut is then made on the inside of the eyelid to release the contents of the cyst. It is a minor procedure.