Hi!
I am 26 years old and one year ago i was having EXACTLY the same problem like you and my lump became like an apple in few months. i was to the dr but in the beggining they said that i am too young to get scared to have breas cancer especially tht i dont hve cases in my family and the send me home asuring me that the lump will disapear. Nothing happend and i went alone and did a biposy and the result was positive: IDC, stage III.Now i am on chemo 6 cycles and then mastectomy and then god knows what! Dont be afraid and dont wait like me too long!Hope 2 hear soon from u, good news.
Dear RachL777, Without further evaluation including physical examination it is impossible to say what this is for sure. Following through with the evaluation as suggested by your doctor is recommended.