I am sorry to see that you are unhappy with your results, I would recommend bodytite for your arms to smooth out and tighten the area, consult with a board certified PS.
As others have mentioned here, the best approach for your contour irregularities and excess arm skin is an extended arm lift where arm skin is removed. Arm scars can end up being thin or thicker. However, in thinner arms, where there is not too much fat, they tend to be thinner. Thus I think you will end up with favorable scars from the procedure. The placement of the scar depends on who is your chosen plastic surgeon and what he or she prefers. In my practice, I place the scar at the lower side of the arm. Please see our arm lift gallery for examples.