My otherwise healthy toadstool had some kind of small injury and algae started growing there. I removed the algae and a bit of rotted tissue came off. Since then, if I touch it every few days more dead rotted tissue sluffs of the edges so the hole is slowly enlarging. What do you think - leave it as is, cut off the rotted area to get a clean cut and remove any rot, dip it in iodine or just dab it on or something else?