I still have a lump where my mole was removed by punch biopsy -- should I be concerned? (Photo)

I had a mole removed on my side under my armpit (right under my bra strap) by a punch biopsy on March 2017 (10 months ago) it came back benign and about 3 months later i had it removed again because some pigment came back, once again by a punch biopsy. This time it was deeper and I got 2 stitches but still came back as benign. Its been 10 months and I still have a what feels like a firm lump on the site of the biopsy. Should I be worried?