The picture of your belly button shows that it is dark. You have indicated that you are 1 week postop from a tummy tuck, and you are concerned about the postoperative appearance. It is possible that your belly button is not healing as well as the skin around it. This is because during an abdominoplasty, the skin around the belly button is commonly disconnected from the belly button, and the belly button has to survive on it's own blood supply, until the new belly button/skin interface matures. During this process, the color of the belly button may change, perhaps even several times. Congestion of the blood supply, scabbing of the skin, slough of the skin, the healing of the skin, blister formation, infection, and other causes are all reasons that the color of the belly button may change. It is not possible to know from a single picture and without the benefit of a physical exam. A follow up with your surgeon is the best way to facilitate continuity of care and address your concerns.