Loss of elasticity of skin, loosening of ligaments and gravity, induce changes in the neck, which contribute to aging. There is appearance of transverse folds, wrinkles and gravity induced platysmal bands. There could be increased fat in the area under the jaw, which sags down too.
Rejuvenation of the neck is chiefly surgical and involves correction of the structural changes, such as lifting and tightening the sagging platysma, removing the excess sagging skin and liposuction of the under chin area. This lifts the neck up and tightens it. It gives better contours to the jaw and better youthful looking neck. Sometimes, Botulinum Toxin can be used to relax the tight neck muscles and improve the appearance of the jawline; the transverse wrinkles or creases can be filled with a hyaluronic acid filler. Read more about this in the section on Fillers, Botulinum Toxin and facelift.