Bra Fold (armpit-axilla) and Chest Junction
There is a small amount of fat/skin that can bulge out when the arm is placed against the body and many women complain about that small region of bulging that is visible when wearing tank tops.
this region can be carefully sculpted using smartliposuction. care to avoid excess suction is required as there are some natural skin folds (think accordeon effect) when the arm moves from outstretched above the head to down against the body.
pictured below is a patient undergoing armpit fold liposuction.