What is Making the Tissue on my Right Breast Turn Black? (photo)

The skin is clearly necrotic. I agree this is rare. Even in the early pictures the skin seems quite thin. It seems its a mater of time that the implant becomes exposed or infected. You may want to consider smaller implants or possibly fat transfer before re augmentation. 

I am sorry to hear about the complications you are experiencing;  this is indeed a rare complication.  I have yet to see it.  Although online consultants can only speculate as to the  cause of the problem, your plastic surgeon will likely have a better idea of possible causes.

 The main concern, as you know, is that there is an underlying breast implant. If this tissue necrosis is a full thickness problem,  then eventual exposure of the breast implant is a possibility.   This exposure would  necessitate breast implant  removal.

 Although, there may be several ways to handle this complication, it may be in your best interest to have the area excised and closed, even though it will  mean downsizing the breast implant (s).  Doing so now in a “controlled” fashion, before there is an open wounds and/or implant exposure may be in your best interests.

 Again, your plastic surgeon who knows your situation best will be your best resource for precise/meaningful advice;  continue close follow-up with him.

 Best wishes;  hopefully you will achieve your goals in the long term.   Please keep us updated with your progress.