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.
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.