A skin expansion system (1) for reducing a wound surrounded by tissue, the skin expansion system (1) comprising； an elastically deformable tie (5) intended to extend between the tissues surrounding the wound in such a way that tension in the tie (5) produces traction along the tissues surrounding the wound in order to bring said tissues closer together, the tie (5) having first (5a) and second opposing ends, a tensioner (10) suitable for maintaining tension in the tie (5), in which the tie (5) is suitable for suturing the wound by passing directly through the tissues surrounding the wound in at least two suturing points, the tie being made from a biocompatible material and comprising a suture needle (6) rigidly connected to the first end (5a).
