Neck liposuction involves liposculpting of superficial fat in the neck. It is very efficient in young patients with deposits of fat over the neck muscles without muscle deformity (muscle bands). It includes contouring of jawline as well. Procedure is done using 1-3 small incisions underneath the chin and behind earlobe. Neck lift is procedure that in most cases involves neck liposuction plus adjustment of neck muscles (platysma, dygastric muscles) and deep fat compartment underneath platysma muscles. In same cases it also involves removal of redundant skin in front and behind the ear. Good luck.
Liposuction of the fat beneath the chin is a fairly minor procedure that uses small incisions to remove fat above the platysma muscle. It is useful if there is fat but minimal excess skin. In my practice, a neck lift is a more extensive surgery performed for excess skin in the neck. A neck lift involves skin undermining and excision of skin, and tightening of the platysma muscle, often through incisions beneath the chin and sometimes also in front of the ear. Depending on the needs of the patient, it may also include fat removal under direct vision during the surgery.