Mucous cysts or bubble of filler? (Photo)

I’ve had lip filler twice and both times I’ve spent the next 2-3 weeks with these bubbles on my top lip. I used to get a single small mucous cyst on my lower lip as a child but haven’t had it in over 10 years. These bubbles look similar but is it just spots of filler or is it my bodies reaction to the trauma creating cysts? My doctor uses a needle with multiple injection sites, could that be a factor as well?