I have terrible pain and a hard area 3 weeks post BBL. Is this normal? (Photo)

I am very nervous, I am going on 3 weeks post op bbl, not much fat survival at all. My left side of the left buttock has a rock hard mass that hurts even to the touch. There's small bruising/red coloring. What could this be?? My surgeon looked at me for two seconds and said "don't worry", but I feel that this amount of pain is abnormal as well as the hardness. It also feels warm to the touch.