A jowl is the sagging skin that forms along the jawline, either side of the chin. Jowls often develop with age and are caused by 3 main factors: loss of facial volume, loosening of the skin and laxity of facial ligaments. These factors result in skin from the mid-face (cheeks) dropping down and forming nasolabial folds, marionette lines and jowls. The main principles of treating jowls are to restore mid-face volume, lift sagging skin and regenerate skin collagen.