Appears as necrotic graft. You need immediate medical attention to treat this complication. Sorry for the issue.
Thanks for your pic and questions. From the picture it appears that you are healing and if a full thickness graft was done then majority of the areola is vaible and the nipple will take longer to vascularize. You may lose some height which is very normal and some pigmentation. You can always see a medical tattoo artist in 6 months to improve the transition and coloring. Make sure you are healthy and eat a well balanced diet and stay away from smokers. Best of luck.
Thank you for your question and photo. Nipple grafts will often undergo a certain degree of slough of the top layers of skin. While I cannot be certain from the photo, it seems likely that you are losing the most superficial layer of skin from the nipple, but may still have sufficient deep layers that have taken and will provide a satisfactory final result. At nine days post op, there are some basic measures to optimize your results: No smoking or second hand smoke, Gentle washing and antibiotic ointment. Be aware that thinks may look a bit worse before they look better. All the best.