A year after my thread lift, I feel a lump in my face. Why?

Without photos and more information, what can be said is that threadlifts, besides being relatively expensive and with results not lasting much longer than well placed fillers, carry an relatively high complication rate that includes such issues as infections, skin dimpling, and even thread extrusion. It was for these reasons that I gave up performing then a number of years ago already. It is possible that shifting of the thread or excessive fibrosis may be contributing to this problem. You would be well advised to make sure that you consult with a board certified cosmetic dermatologist or other core aesthetic physician. Best of luck.