Some Pigment Left Behind After Mole Biopsy

The is called a recurrent nevus (a mole that came back after removal). If the original biopsy showed a benign growth (not cancer), than the recurrent nevus is also benign. This can be removed for cosmetic reasons.

If a mole was shaved and read as benign then I would not worry about recurrent pigment. If the pigmentation bothers you it can be further removed or can often be faded with cryotherapty(freezing).