Open rhinoplasty involves several cuts, stitches, severe swelling, and scarring, but its results are prominent. In closed rhinoplasty, on the other hand, only two small cuts are made inside the nostrils, so it involves no scarring and less swelling. However, you should not expect great changes after closed rhinoplasty.
In open rhinoplasty, the surgeon lifts the nasal skin by making several incisions around the nostrils and under the septum. After changing the nasal bridge shape and fins, he backs the nasal skin and closes the incisions. In closed rhinoplasty, the surgeon makes an incision inside the nostrils and doesn't lift the nasal skin. An open nose job results are more prominent than a closed rhinoplasty, but it involves prolonged recovery and more scarring.