The use of biostimulatory fillers that promote new collagen and elastic fiber synthesis can be helpful for adding hydration and improving skin turgor, both of which can contribute to tighter skin. In my NY practice, I would use diluted Radiesse or Radiesse mixed with hyaluronic acid. Occasionally, a filler, such as Restylane Silk may be used. These can be injected in a microdroplet grid pattern across the upper inner arm or via fanning. In my Israel satellite facility, where a far greater number of regulatory agency approved skin boosters and biostimulatory fillers are available, I would use Profhilo with the seven point bolus technique or biostimulatory fillers, such as Luminera HArmony CA or Neauvia's Stimulate or skin boosters, such as Viscoderm Hydroboosters, Restylane Skin Boosters, Hydromax, Juvederm Volite in a microdroplet grid pattern or with the fanning technique. You would be wise to seek consultation and treatment by a board certified aesthetic physician. Best of luck.