Bump in area of extraction and implant placement surgery 6 weeks post back after being treated, what is this? (photo)

Hi, I had a tooth extraction & same-day implant placement (1/23).I had pain post surgery w/ nasal discharge.I was put on Augmentin (7 days) and Methylprednisolone (5 days). Approx. 1mo. post, a bump developed.My dentist popped the bump & treated w/ Chlorhexidine for 2 wks. He noted a greater amt. of bone loss than expected. 2 weeks post Chlorhexidine, the bump is back (see pic).What is this is and how should it be treated? Should I continue with my dentist or go see a specialist?