Best Treatment for Necrotic Areolas, Nipples and Attached Scar?

That is a really unfortunate outcome, and I'm sorry you're going through that! Partial or complete nipple loss is a recognized potential risk of breast reduction, but thankfully uncommon. It is not clear to me what technique of reduction was used based on the photos. It looks like you have incisions extending on either side of the nipple areola complex. At this point, based on the appearance in the photos, I would recommend antibiotic ointment to the black and yellow dry areas until they soften and peel off (or are conservatively debrided by your surgeon). The end result may look better than expected. If nipple areola reconstruction is needed, and/or tattooing for pigment, this can be done once you have healed. Good luck!

I am sorry that you have had this difficult problem.  See your surgeon frequently so that they may do the best they can to help you through this process.  Most likely you should let it heal for a few months, then reassess for revision surgery and tattoos.

This is an unfortunate occurrence that you are going through.  Please listen to your surgeon as you go through the delayed healing process.  Wet to dry saline dressing may be sued or antibiotic topical such as Silvadene is frequently used.  After a period of time your surgeon will be able to see more clearly what is left and what is missing and determine which route to take on reconstruction of the nipple areolar complex.