The eyelids serve the functions of protecting and lubricating the eyes. They have a firm curved plate called the tarsal plate, and muscles which open and close the lids. The overlying skin has folds or creases to allow the lids to move up and down. Underlying these layers the orbit contains fat to allow the eye to move.

The skin may become involved with lumps or cysts which may be benign or malignant. These may be removed as partial or full lid thickness excisions and the lid repaired or reconstructed. Closure may be direct or using skin flaps or grafts. Abnormal tissue removed is sent to the pathology laboratory for analysis (histology) to determine a diagnosis and clearance margins.