If fat is the only issue causing the sagging, Liposuction can be excellent for this area. If very small amounts of fat are present, lipodissolve may work. However liposuction is a single definitive treatment and lipodissolve involves multiple in-office treatments with variable results.
But if the problem isn’t just excess fat but also laxity in the skin and muscle, it may be wise to consider other treatment options such as a facelift or necklift. The best course of action is to schedule a consult with a Board Certified Plastic surgeon, who can then walk you through the treatment options available that are tailored to your unique set of needs.