Really confused on what I should do regarding the infection I've developed after my BBL? (Photos)

I had liposution and fat grafting done 2 weeks ago i had an allergic reaction to the antibiotics i was taking after three days post operation. The doctor did not replace thr antibiotics now 2 weeks past and i developed a red hot spot over my butt its fairly big and its swollen also really painfull. I was sent to hospital i have high fever and was treated with strong antibiotics for 24 hours but my body did not respond they want to drain the infection out If not successful theyll operate on me