Reoccurring stye on my left upper eyelid for ~1 yr? ill go a few weeks without anything and then itll come back, or itll get a bit swollen for a couple days, go away on its own, come back worse a few days later. what could be causing it?

A stye, or chalazion, is a blockage or infection in one or more of the oil glands of the eyelid (Meibomian gland). These glands open near the margin of the lid. It is possible that some scarring has occurred leading to repeated obstructions or infections. It can be treated by an ophthalmologist either medically or surgically, usually in the office.