How can you tell if you have an infection in your buttocks after a BBL procedure?

I had a BBL procedure done September 29th which will be 2 weeks on Thursday. Since I had this procedure done I've been experiencing throbbing on my top left cheek. It's not excruciating, and it's not red either.The discomfort comes and goes but what it really look like,like my plastic surgeon over injected that area on my cheek because it looked swollen more than the other cheek since the 1st day of surgery. My surgeon said that I was fine but to me it looks like a fat pocket or a fluid pocket