Big bump after Mint thread lift - Any advice how can I get it fixed? (photo)

It is hard to see from the photo, but it looks like you may have some buckling of the skin from the threads. These "bumps" will usually settle down and eventually go away by itself usually between 1-2 weeks but sometimes they can persist for several weeks. If this is really bothering you, the threads can be removed, but since you only had it done a couple days ago, I would just wait it out.