Well, I'm 17 and I have been on birth control for roughly a year. About 6 months ago, I noticed an incredibly small lump in my breast that I forgot about until now. It's slightly bigger, and feels rubbery to the touch. I can also move it around. Every once in a while, I feel a pulse of pain coming from it, but it disappears quickly. I don't want to freak myself out and think that it's cancer, but I really would like an opinion on what this could possibly be.