When I was 14 my right nipple started getting a little sore and abit bigger. Now I'm 15 my right nipple has died down but my left nipple has got really big and bloated and it feels like there is a little rock underneath. In the last couple of days my right has started getting a little bigger again.
Also they go down quite abit when it's cold, does this happen to anyone?
What is happening to you is gynecomastia you are developing larger breasts.