It's possible that excessive massaging of the lips after filler injections could contribute to filler migration, especially within the first few days post-procedure when the filler is still malleable. However, after six months, the filler should have integrated into the tissue, and migration is less likely to occur from massaging alone. The prominent skin fold you're noticing could be due to several factors, including the natural resorption process of the filler, uneven distribution, or even the natural anatomy and movement of your lips. It's also possible that what you're experiencing is a localized accumulation of the filler, which can sometimes happen with hyaluronic acid fillers like Juvederm Ultra. For a more accurate assessment and potential treatment options, I recommend scheduling a follow-up appointment with your provider. They can evaluate your lips in person and determine whether you might benefit from additional treatments, such as hyaluronidase to dissolve any uneven filler or additional filler to balance the appearance of your lips.