After a breast biopsy & diagnosis of fibroadenoma in oct 2012, another lump formed - md said it was a hematoma. still has not gone away. what do i do?

Close follow-up: It could certainly be a hematoma following biopsy. This could take several months to completely resolve. It also could be residual or recurrent fibroadenoma. Was the oringal one completely removed or just a needle biopsy? Either way, at your age it is highly unlikey to be malignant. Have it followed by self-exam and/or your family doctor.

Nothing: Not too uncommon after a biopsy of a breast lesion or surgery to remove a lump, a hematoma might form which is basically an area of bleeding inside the biopsy or lumpectomy site which has congealed and clotted. It could take months for this to resolve and scarring may take over the area and a "lump" could persist for years. This generally is just left alone unless infection (an abscess) occurs.