Mole removed a week ago,and a tiny piece was left behind. Does it need to be re-shaved? (Photo)

I had a mole removed a week ago mainly for cosmetic reasons, the mole was dark and raised. Today I noticed that the edge of the mole was not removed when it was shaved. I would like for any dark spots to be completely gone, do I need to have it re-shaved? It looks like the dermatologist missed a tiny piece, and although its small I'd raher not have any dark discoloration left behind. What would need to be done?