I've had several moles removed in the past and never needed stitches. This was the first time I ever needed stitches after the initial biopsy, same doctor the past 4 or 5 times. I think if the moles come back mildly abnormal, most doctors don't require a 2nd biopsy. If the mole is severely abnormal, a 2nd biopsy is needed if the margins are not clear to be sure all of the mole is removed. If the mole is moderately abnormal, I think the call is up to the doctor whether to remove it to get clean margins if the margin isn't clear. My biopsy was moderately abnormal.

IDK, every time in the past when I've had a mole removed, the doctor removed it all, but this mole I have is particularly large, and she shaved off some for the initial biopsy and I can still see the edges of the mole around the stitches.