I had a bbl 3 weeks and 3 days ago, 4 days ago I started developing this lump no fever or anything, my doctor recommended I take some antibiotics, but it didnt go away, on the 2nd week post op I was hit on the buttock with a suitcase,could this be a hematoma because of it? But if it is a hematoma is it possible that it developed a week after the hit? Or is this fat necrosis, how do I find out? My surgeon is abroad, and is necrosis harmful?