Black Dot Appeared After Mole Removal

Normal moles have a maturation process. They start out as flat pigmented (brown or tan) spots, that eventually become raised and flesh-colored. Trauma to the mole, such as a scratch or any surgery, can stimulate the melanocytes (cells that make up the mole) to produce pigment again.

Raised benign moles usually have two components: one above the skin surface and one below. When a mole is shaved off the surface of the skin, the deeper component remains. The removal itself stimulates the melanocytes to produce pigment again. This is what accounts for the black spots in the scar as the mole grows back. It may not raise again but the pigment does come back.

What is important is to know that the mole was benign on biopsy. If it is then the recurrence is not important. If the mole had some abnormalities, it's recommended to have the rest of the recurrent mole removed.

In order to make sure any mole is completely removed, both the superficial and deeper component need to be removed such as with a punch biopsy and stitches.

This is likely a recurrence of the mole. If it was removed with a scalpel, the question is how it was done. Was the mole shaved off or excised by cutting it out? If it was shaved the recurrence is very high, almost guaranteed. The recurrence can even occur with excision. It depends on how much of a margin you take with the mole sometimes as well.  If you the margins are 3 mm the recurrence is low teens, 4mm high single digits, 5mm lower single digits, percentage wise. 

The good news is that the lab test showed the mole was benign. That being the case you don't need to do anything. Over the next year you should expect the darkness to fade naturally.

What may have caused this to happen? Even flesh colored moles have pigment cells. When the top is removed the root of the mole below is triggered to try to re-grow another mole. Since it can't, the pigment production is the best it can do.