Breast biopsy revealed fibroadenoma in oct 2011 - another lump developed seemingly as result of biopsy. hematoma? family history of bc on both sides.

Yes: It could be a hematoma if it appeared within the first week. If later it is probably scar tissue from the surgery. This scar tissue usually resolves over 6 months to a year. The familial history of breast cancer requires vigilance on the part of patient and physician.

Hematoma.: Cutting needle core biopsy can cause internal bleeding at the site of biopsy; this is common, and causes a lump that shrinks slowly and turns into fibrous scar over time. If it starts out large, the lump can be permanent. On the other hand, cancer can occur so vigilance is important. At age 24, breast cancer is very very rare, but as you get older, screening will become more important.