A chalazion forms when an oil-producing gland in the eyelid called the meibomian gland becomes enlarged and the gland opening becomes clogged with oil. During the procedure your eyelid will be lifted and turned inside out using a clamp. A very small incision will be made on top of the cyst inside your eyelid. The tissue inside the chalazion will then be scooped out. The incision on the gland is then left to drain in a smaller chalazion while the cut in a larger chalazion will be stitched.