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The knot is basically tied at the wound base to reduce the risk of tissue reaction and knot extrusion. If the suture is positioned in a more superficial manner in the dermis about 2-4 mm distance from the wound edge, then eversion is increased.
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Buried horizontal mattress suture The buried horizontal mattress suture is a type of purse-string suture. This type of suture has to be placed in deep or mid part of the dermis so that skin is not torn. If the suture is made very tight, it may actually choke the approximated tissue. Running horizontal mattress sutures In this style, a simple suture is made and the knot is not cut but tied. A horizontal mattress suture series is placed in a continuous manner. The final loop is tied to the suture material’s free end. Running subcuticular sutures A running subcuticular suture can be described as buried form of the running Horizontal Mattress Suture. This is placed by making horizontal bites throughout the papillary dermis on the wound’s alternating sides. The suture marks are not visible and this suture may be kept in place for some weeks. Running subcutaneous suture The running subcutaneous suture starts with the creation of simple interrupted subcutaneous suture which is not cut but tied. The suture is then looped through subcutaneous tissue and passed successively through the wounds opposite sides. Its knot is tied at the wounds opposite side by tying suture material’s long end to the last pass’s loop. Variants of tip sutures The Modified half-buried horizontal mattress suture is a style of suture in which an extra vertical mattress suture is positioned superficially to a half-buried horizontal mattress suture. Instead of forceps a small skin hook is deployed in it to evade the flap’s trauma. The deep tip stitch is actually a fully buried variant of three-corner stitch. The suture is positioned into the wound edge’s deep dermis to which flap is attached. The flap is then passed through the flap tip’s dermis and pushed into deep dermis of wound edge at the opposite side.