Black belly button. Will the color change or is there something that can be done to fix this now? (Photo)

Thanks for your question and photo.  I am sorry that you are having a problem after your tummy tuck.  The black discoloration may indicate skin necrosis (death).  It is best to see your surgeon for wound care instructions.  If the belly button does die, you may need a secondary reconstruction to recreate your belly button.  Good luck. 

I disagree your navel looks black, maybe a little congestive, but definitely not necrotic. Do address this issue with your surgeon.