Hi Thanks for your query. This is good that you found a lump. Self examination saves many lives and you should do this frequently. As per your history the lumps is of a short duration so the possibility of this having a cancer is very very less and you are young enough. Breast cancers do not occur usually at such an early age. The most probable diagnosis is fibrocystic disease or fibroadenosis. I would advise you to undergo: Mammography Ultrasonography FNAC- fine needle aspiration cytology to get an accurate diagnosis. Take the medicines as per clinical presentation as seen by a Surgeon or Oncologist