This does involve scars—but if loose skin or a low nipple is the problem then a lift (mastopexy) is the only solution. There are various types of lifts with different lengths and scar locations. Dr. Teitelbaum will discuss the scar options for your situation.
If a pre-existing implant is too high, then the implant and, often, scar tissue are removed surgically. Then, a new implant is placed a bit lower so that it pushes what was the drooping breast tissue outwards and upwards.