The horizontal mattress stitch is a suture technique used to close wounds. It everts skin well and spreads tension along the wound edge. This makes it ideal for holding together fragile skin as well as skin under high tension such as the distant edges of a large laceration or as the initial holding suture in complicated repairs.
The vertical mattress stitch is a suture type used to close skin wounds. The advantages of the vertical mattress suture are that it provides closure for both deep and superficial layers, and also allows perfect eversion and vertical opposition of the superficial skin edges.