This problem is quite common in my experience, and I have found that a series of treatments using HA skin boosters can work well for smoothing this kind of fine crinkling of the neck. A profile view would have been additionally helpful for assessing the contribution of jawline laxity to this problem. such laxity is a contributing factor, then an HA contouring filler can be used to help to straighten and better define the jawline (and, secondarily improve the upper neck skin below). Likewise targeted microdroplets of Botox injected in boluses along the upper and lower jawline and upper neck cold further lead to lifting and tightening of the this area. In experienced hands, all of the aforemenitioned approaches can be performed in about 30-30 minutes in one treatment sessions if needed and so desired. You would be wise to consult with an experienced, board certified cosmetic dermatologist injector expert and best of luck.