6 weeks PO there is separation and opening of the incision. Silver sulfadiazine is turning my skin black. What do I do? (photo)

I had a tummy tuck on March 21, 2019. I'm 6 weeks post op. All is healing well with the exception of a slight seperation and opening of the incision. My surgeon office claims that this is normal and that i shouldn't worry. I've emailed pictures and i was seen and i was prescribed silver sulfadiazine and I'm to apply it 2x a day. Im keeping it clean and covered. The cream isn't working if anything its turning the surrounding skin black. What do i do?