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You need to get a clinical evaluation and a consultation with your breast surgeon. If the necrotic tissue is large and spreading, then it would need to be removed and the breast reconstruction surgery done again.
On the other hand if the necrotic tissue is small, not causing any symptoms, is not infected and if your surgeon advises you a conservative approach, then you can just carry on with the regular breast self exams and periodic evaluation by a physician.
Hope this helps.
Good luck.