I'm a 25 year old with breast tissue in my armpits. During a yearly physical and breast exam, my family doctor palpated my armpits and determined it to be breast tissue. That was a few years ago and I was less bothered by them at that point. Now they are fluctuating in size with my menstrual cycle and are uncomfortable. Not only do they make me feel self-conscious with tank tops etc., but they are sore and annoying as they seem to always get in the way.