Recurrent infection/swelling after facial fillers in November, what can I do?

I have had facial fillers (lines around nose and under eyes) back in November last year and since then every few weeks/6 weeks have had mild pain and swelling especially underneath eyes. This usually goes down within 1-2 days but cannot see this is normal - this is only the second time i have had facial fillers and both times i experienced swelling 6 weeks after the procedure. I have tried sinus medication, antibiotics, antihistamines etc. Please can you help?