If you have a dark or widened scar after tummy tuck, revision is your best bet. Sure, there will still be a scar, but it will likely be narrower and less visible. Of course, it has to heal for another full year or so to fade and soften, and during this time it is critical to avoid ultraviolet exposure of any kind (sun or tanning bed) to avoid hyperpigmentation.
Some patients consider "hiding" the scar by over-tattooing flowers, leaves, or colored patterns, but I think this actually draws more attention to the scar, so I absolutely understand your question. The problem is that "flesh-colored" tattoos, in my experience, seem to have about one chance in a million of actually matching your skin color. (I tattoo nipple areola complexes for breast reconstruction and know this is a fact.)
And when it doesn't match, the discrepancy is like a neon sign that says"I HAD A TUMMY TUCK AND AM TRYING TO HIDE THIS SCAR BUT FAILED!"
Good question, but just say "NO!" Best wishes!