Had breast biopsy done 3 months ago - benign. Feel lumpiness near biopsy site but not right there. Had u/s and didn't see anything. OKay?

What did the biopsy. show? if it showed fibrocystic disease, then lumpiness is part of that process. Please follow your doctor's advice for follow up care.
Scar. It could be a scar, may reduce is size over time, Have it checked out again if gets bigger.