HORIZONTAL MATTRESS SUTURE
The horizontal mattress suture is placed by entering the skin 5mm to 1cm from the wound edge. It is passed deep in the dermis to the opposite side of the suture line and exits the skin equidistant from the wound edge (like a deep simple interrupted stitch). The needle reenters the skin on the same side of the suture line 5 mm to 1 cm lateral of the exit point. The stitch is passed deep to the opposite side of the wound where it exits the skin and the knot is tied.