Hello L. Most patients when they mention "skin tightening' actually mean "skin lifting". This will not happen with an Erbium. Erbium and CO2 resurfacing are very close to each other in result and both can help make the skin firmer, refreshed and have a better texture (wrinkles, acne scars). But if you are looking for lifting of the neck or face, you should consider surgical procedures. To see examples of Erbium laser resurfacing, you can visit the link below.
Though capable of producing some thermal skin tightening effect the erbium laser is mostly great for resurfacing and rejuvenation of the skin or mucosal membranes. However, it is an unmatched tool in perioral wrinkles reduction