Neck lift with or without facelift for saggy neck skin
Without a photo or face to face exam it is impossible to say what you should or could do or even know exactly what the problem is. The range of possibilities include liposuction, an isolated neck lift to a full facelift. If it is really minor some noninvasive approaches like thermage or smartlipo may suffice.
My response to your question/post does not represent formal medical advice or constitute a doctor patient relationship. You need to consult with i.e. personally see a board...