Your photos are helpful but an examination can more definitively provide you with accurate information. It appears that a full tummy tuck with a limited lateral extent of the scar may be a reasonable approach as you already have the vertical scar and given your concerns regarding your belly...
If the scar on the lip bothers you, I would recommend surgical scar revision to remove the bad scar and attempt to improve the overall visibility of the scar.
Not all elevated, thickened scars are the same. Scars that grow beyond the borders of the initial injury (incsion, cut, etc) are referred to as keloids. They are not as common as hypertrophic scars but are more challenging to treat. Steroid injections can provide benefit but...