A week ago I started noticing my right breast growing larger...It is now about a cup size bigger then the left. It isn't really pain as much as it is an odd discomfort an some tenderness. I'm not worried about it being cancer as much as I just want to know what is going on. Im only 18 and its starting to worry me. This morning when I woke up there was a bruise along the top portion of my right breast. What could cause this?