What you describe is most likely a cyst and these develop due to the hormone levels in the body. I doubt a lump would appear due to being struck as you mentioned but it could happen. I think it would be a good idea for you to see your Dr. for a breast exam and some advice as to what you might do to lessen the discomfort you are experiencing. Take care ..
i went to the doctor and its unfortunatly a tumor.
i'm 18 and i've been noticing the same thing but i've ignored it for the last year and a bit? i should go to the doctor too, i've been losing a lot of hair too, yikes! im turning bald now ='( oh no.. a tumor? what will happen? surgery? I'm really scared to go to the doctor.. ><" thanks for posting this up, i now have more courage to go and find a doctor..
its probably not cancerous. I just needed surgery for it to be removed. it was actually quite simple. dont worry too much, but of course go see a doctor!
What was the final diagnosis and outcome of your surgery?