What is the next step if there is something sticking out on my skin after a threadlift for my double chin?

I have not experienced any PDO thread rejection in my practice. PDO threads are usually free-floating, unanchored threads which may get dislodged, unlike anchored threads. However, if you are worried about the material involved causing the rejection. There are a number of reliable brand threads in Singapore that are made of PCL and PLLA. So you may consider using these instead.

Yes, collagen cross-linking can be safely performed after the initial surgery. Although this is rarely performed in isolation. Most commonly it is performed as an adjunctive procedure during enhancement surgery (after the primary surgery) if required.