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When I had a problem with dark patches on a newly shipped yellow figi leather I should have cut a piece to save but I dont have a QT tank.
What I did was with the water I took out as part of a waterchange I placed the whole piece in the bucket with the old water. with 50% force I blew across and directly at it with a turkey baster. Pieces started flying. Glad I didnt do it in the tank. I had to toss it. :-[
Ya know... as I think about it, my toadstool got white patches on it like that when it started fragging itself. If that flesh is still firm leave it be. Can you see points elogating down from the fingers beyond the white (on the bottom) where it is trying to plant those fingers as it frags itself? It may have either had a stress event or decided that those fingers were too heavy and needed to drop off...