Anonymous wrote:It's breast tissue. The upper outer quadrant is the most common area for breast cancer.
http://www.webmd.com/breast-cancer/guide/breast-self-exam?page=2
Anonymous wrote:I had that even when I was a skinny teenager
Anonymous wrote:http://tnation.t-nation.com/free_online_forum/sports_women_training_performance_sorority/fat_between_underarm_upper_pec
Anonymous wrote:I have no idea what you guys are talking about.