Start of nipple necrosis? 9 days post op following breast reduction. (photos)

2 days ago I had my first post-op appointment (currently 9 days post-op BR). My doctor and the nurses said I was healing on track, except I had some discolouration on my left areola. Neither the nurses or doctors were concerned about the discolouration, but I was given gauze and Betadine ointment to place over my left areola. I'm worried the discolouration is getting worse. Could this be the start of nipple necrosis? How soon do you see symptoms?

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