I'm not sure how to explain what you are seeing, but I think it is unrelated to the filler. By a year, most of the filler has likely resorbed. It could be some sort of delayed inflammatory reaction, but again would be unusual 1 year out, unless you have been ill recently which can activate the...
It is very unlikely and not possible for injection performed 6 months ago to cause a blister 6 months later. I wish you would have circled what you see and call a blister on the photo. There is redness even under your nose. You need to mention duration, any symptoms with it.There are many causes...
The spot on your upper lip is unrelated to your previous lip fillers, which is mostly dissipated by now.
It looks like sebaceous hyperplasia to me.
It is definitely not migrated filler as suggested by the inexperienced assistant Jessica in the previous response.
If you have a dermatologist, I...