i recently have had a biopsy on the shaft of my penis, on the foreskin, i had stitches in there, but now the skin has healed and the stitches are out, underneath where the scar is, there is a painless lump, is this normal, im not sure weather it is the knot of one of the stitches becouse of of my stitches feel out in the night before the doctors took them out?