What should I do about skin that turned black after breast lift? (Photos)

 Thank you very much for that question and the added pictures. It looks like the part of the skin that has turned dark is necrotic. This is the area that will get least the blood supply after surgery so it is a complication that we do see at times. Looking at the pattern of the necrotic skin in your case it looks like it is fairly easy to solve. However you need to go back to your plastic surgeon to let him arrange further treatment  the long-term result should not be compromised if your doctor deals with it. However it is a complication. These things can happen even without any one of the involved parties having made a mistake. I am sure that you have a postop consultation scheduled already. Otherwise do call today and allow your doctor to  plan further treatment with you.  Have a wonderful rest of the day and greetings from the beautiful island of Jamaica. 

It looks like you are not getting adequate blood supply to the area that has turned black resulting in Necrosis of the tissue.
This area will likely need to be debrided and a wound care routine put into place.
You need to call your surgeon and schedule to see him/her to come up with a treatment plan. 
Best Wishes,
Dr. Sadrian

Guess you will have open necrotic wound shortly. Guess you need to return to the clinic you used fr care. Good Luck. Or you can seek pre paid care from a private practice boarded PS...