Congratulations on your weight loss! Taking into consideration factors such as downtime, cost, and predictability, the best treatment for you is likely dermal fillers. There are a variety of fillers currently on the market, however I have found that Restylane works best for the under-eye area. Restylane is made of hyaluronic acid, a molecule found naturally in our own bodies, and is temporary but malleable. In my practice, Restylane for the eyes is injected through the use of a cannula, a long, blunt-tipped needle. Utilizing a cannula allows for maximum comfort and safety, and minimizes bruising and swelling. The effects of Restylane generally last 6-9 months, but can last longer for some patients. Be sure to consult with a board certified Dermatologist to further discuss your treatment options. Best of luck!