It doesn’t heal the scar, but it does re-align all the tangled scar tissue (similarly to the cords behind most people’s computers). Essentially, when the body is damaged it lays down scar tissue to help compensate for the damaged tissue, when this happens, the body’s primary goal isn’t efficiency but to “plug the hole” to be able to keep going the best it can. Unfortunately, this method lays down fibers haphazardly in all directions and through multiple layers.