Necrosis is the cell death that takes place when they have been damaged irreversibly.
Necrotis tissue is dead tissue or tissue injured beyond repair – non-viable tissue. This can be a portion of soft tissue or an organ.
It is often present in wounds and in order for a wound to heal, the dead (necrotic) tissue must be removed and substituted (repaired) with newly generated tissue (granulation).
Necrotic tissue provides an ideal growth medium for bacteria.
There are two major types of Necrotic tissue:
Eschar, which is a hard black crust-like structure.
Soft necrotic tissue, which is moist, white/yellow/grey slough.