Can threads/cogs in the face leave scar tissue? (Photo)

Im sorry to hear about your discomfort. They should have been removed 2 - 4 weeks after they were placed since they were still uncomfrtable. Few months later it will be very difficult to remove. I suggest RF treatment like Tempura over the area that hurts an dit will soften the thread. Can't...

Very likely that any foreign material like a tread should be removed once infection happened. This is the issue you should discuss with your surgeon. Good luck.

I think you look great. There is no super visible asymmetry present. On the photo included, I notice more fullness of the right jowl area. Maybe you have grinding teeth issue? This fullness can be treated with Botox/Kybella and Ultherapy. You also need a little more support to the chin/around...