Black scab around nipple seems to be getting worse I think. What went wrong? (Photo)

This is necrosis of the nipple that is the result of the combination of the lift procedure with implants and compromise of the blood supply to the nipple.  It needs to be debrided, although the fact that there is an implant under the wound makes this a logistical problem.  Exposure of the implant will require its removal.

So very sorry that you are having this issue. I would suggest meeting with your surgeon and discuss what will need to be done. You lost some of your tissue from a lack of blood. Your tissue around the area looks like it is healing. Once your tissue has healed, the area can be revised to look much better.

Unfortunately, calling it a "scab" or "non-healing" is an understatement. It appears taht you have tissue necrosis of your areola from lack of a good blood supply. You should see your surgeon right away and get a treatment plan. This may involve removing some of the remaining sutures to limit the damage, or debriding the necrotic tissue. You need to expect to need a few procedures to fix this.