Is this necrosis? I had a bilateral mastectomy July1, 2016. (photos)

When I went back for a follow-up, my plastic surgeon said there was a flap of skin he was concerned about. However, after my second follow up and the removal of two of my four JP tubes and bulbs he said that it was looking better. The area now has an odor and has a burning sensation from time to time. The surgeon closed early today so I couldn't call him with my concerns. I am afraid I have an infection and am wondering if I need to call the on all MD.