I had my op (aux dissection) 8 weeks ago after having aux clearance & lumpectomy 4 years ago. Surgeon went through same scar and the area became red and hot. GP put me on antibiotics but got hospitalised for infection where they used ultrasound, local anesthetic and drained some fluid (which was tested and found to be free of any bugs) then was put on IV antibiotics followed by oral which were different to the ones the GP prescribed. I have been left with a seroma which at times is hard. The site is still uncomfortable and sensitive as well as being a bit pink. I've seen a BC experienced physio who has massaged the area and told me it is taking longer due to the radiation tx I had 4 years ago, have had oncology massages. I still wear bras most of the time. Hopefully it will settle in time. :|