What could be causing an upper bleph abscess? (photos)

I had my upper lids done on 4/25/18. Since this time I have been getting what appears to be an abscess on the surgical line, one on each eye. I have had cortisone injections, had them opened and drained only to come back. My surgeon is at a loss and is now recommending we cut the abscess out and clean out the surgical sight, cauterize and re-suture. I am nervous to move forward with another surgery. What could be causing this? Would you recommend moving forward with this surgery?