Pain and Bruising 4 Months After Fat Transfer?

I am 4 months a 10 days from liposuction and fat transfer to the buttocks. I received 1100 cc's in each cheek. My problem is that I fear that I may have an infection. My right cheek still has a red bruise about the size of a silver dollar and it is hot to the touch and throbs in pain on and off during the day. The area around that bruise is numb. What could this be? This is my third time having this procedure and I've never experienced this the first 2 times.