Necrotic tissue is dead tissue and is no longer viable. It can cause infection or it just serves no purpose even with blood flow within the area. It’s impossible for it to be reversed. Why can’t it be though? What progress have scientists made with that?
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It’s dead. We can’t make dead things undead. The tech doesn’t exist. When living tissue dies, a whole host of biological and chemical processes cease and the tissue very quickly starts to decompose and break down on the cellular level. Connections to other tissue is severed and the dead tissue has no defense against bacterial and cellular agents that eat and destroy the once living tissue. Repairs (which happen constantly in living tissue) don’t happen and defects build up. Once a certain point is reached, the tissue is simply dead and unrecognizable to the body.
You can keep living tissue alive by slowing biological processes (like, e.g., putting an organ for transfer on ice), but even then you have a limited amount of time before decomposition sets in. Or you can keep it alive by keeping it connected to a blood supply to provide nutrients and carry off waste, but that’s only a necessary but not always a sufficient condition.
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