A black mark left behind after mole removal may be caused by melanin deposition after inflammation, or it may be caused by incomplete mole removal. Melanosis after mole spotting is usually due to inflammation caused by the damage when removing the mole, which stimulates the formation of melanin, which collects in the skin and forms a black mark, and usually fades with time. Incomplete mole spotting results in residual mole pigmentation, which can also lead to the phenomenon of a ring of melanin deposits left behind after mole spotting. The black mark left behind by this condition usually cannot fade away naturally and can be further removed by treatment. If the black pigmentation after mole spotting affects the aesthetics, you can go to the hospital and follow the doctor’s advice to take the appropriate treatment.