Fdl tt suffering from necrosis, will it spread? Doctor says it will just drop off. Advice? (photos)

So I had a fdl tt and my surgeon found a superficial blister on the fdl just below my belly button. He opened it up and it got bigger, now I have a large area of necrosis which is being looked at on a weekly basis and receiving wound care - he says the dead skin will drop off but medical sites suggest that the necrosis will spread, Im really worried. Using bactoban and inadine.