What are these blisters on my lips? Could they be from the lip fillers I got 6 months ago?

Since about a month ago, I realized these blisters on my lips andunder my nose. What could they be? My lips have been tingling from time to time, and gets red along the borders of my lips (perhaps the injection site of the fillers) sometimes. But the tingles and redness goes down after a few hours and it comes back every few days. I’m worried the lip fillers I got 6 months ago is causing an allergic reaction or infection.