he chalazion is caused by a blockage in one of the tiny meibomian glands of the upper and lower eyelids. The oil these glands produce helps to moisten the eyes.
Inflammation or viruses affecting the meibomian glands are the underlying causes of chalazia.
Chalazia are more common in people with inflammatory conditions like seborrhea, acne, rosacea, chronic blepharitis, or long-term inflammation of the eyelid. They’re also more common in people with viral conjunctivitis or an infection covering the inside of the eyes and eyelids.
Recurring or unusual chalazia may be symptoms of more serious conditions, but these are rare.