Is this "burning to the touch sensation" after miraDry normal?

Hi. I had miradry 3 weeks. I was told that according to my weight (255lbs, muscular), I would need 12x 10ml syringes with lidocaine/saline mix, injected into armpit areas. 120Ml of fluid per armpit. Procedure went smooth but now, after 3 weeks, I feel this "burning to the touch sensation" in both inner biceps, starting from armpit extending to inner elbow. Also a huge lump on my left, upper/inner biceps right where the armpit area begins and it's not shrinking. On bactrim now. Normal?