Small lump removed from left breast last week, biopsy report came normal but now a big thick lumph on same place no pain, increasing day by day?

Swelling: It is difficult to say without seeing in you in person. One common reason for post incision swelling is a small bleed or "hematoma". Painless small amount of swelling is not worrisome and should resolve on its own.

Cyst.: This is likely a fluid collection accumulating in the area of the surgery. This may resolve on its own, but would be wise to check with your surgeon.