I have a dermatofibroma that was shaved for biopsy 1 and 1/2 weeks ago. the biopsy cam back no cancer. However, the biopsy started to bleed for several days (starting several days after it) and now it looks like the lump in as big if not bigger/wider and higher than before the biopsy. It seems to have grown back. It doesn't seem infected. Could this be nodular melanoma that had a false negative because of the shave biopsy? Is this something to worry about? Could cancer be down lower in the skin than just the very top of a lump on the skin?