Facial rejuvenation with PDO, PCL or PCLL threads is a current technique to treat facial and neck flaccidity. Intradermal threads are inserted to stimulate the production of collagen and elastin, which give firmness to the skin. This improves cheekbones, nasolabial folds, forehead lines, and sagging neck. Results are gradual and can last up to 18 months. There may be temporary redness and tightness of the treated skin.