Yes, your results from neck liposuction should be permanent in the sense that the fat cells that are removed will not grow back, however if there was any significant weight gain, then the other fat pads (such as those under the muscle) can expand. I would caution you that neck liposuction alone may not be a great option in this case. I happen to do a lot of this kind of work and in your neck, I would seriously consider inserting a chin implant. It will not only improve your profile, but also help take up some of the loose skin that could result from liposuction alone. Furthermore, I discuss the possibility that necks like yours might require skin removal (e.g. neck lift) later if we are unhappy with the quality of the skin that results. I think it is unlikely, and I've only actually done it once, but clearly something you need to be aware of.Good Luck!