<prompt> Which of the following is the most common swelling of eyelids?ChalazionNeurofibromatosisRodent ulcerDermoid cyst  <response>: These are the most common lid swellings. A meibomian cyst is a chronic granulomatous inflammation of a meibomian gland. It may occur on either upper or lower lids and presents as a smooth, painless swelling. It can be felt by rolling the cyst on the tarsal plate.Key Concept:Meibomian cyst: They are epidermal cysts found on the free edge of eyelid. Chronic Meibomian cyst is called chalazion. 