How did I get a third degree burn from my breast reduction operation? (photos)

Did a breast reduction and a roccection in local anasthic 1 year post op. Noticed bleeding from bilisters under the brasts after a few days and called the surgeons office. He told me I had a third degree burn. After 1,5 week the blisters turned hard and went black. I lost all feeling underneth mu breasts. He called me late one day and Said he wanted me to come in emideatly to remove all the black skin and so I did after work that day. enyone know what happend to me?