Name: Kate Holmes Beach, FL (Zone 10a) Not all those who wander are lost.
I think cinnamon works best on treating open wounds. But it may work well here, too. I think the active ingredient in cinnamon needs to come in direct contact with the fungus, here it looks like the fungus is hiding "under the skin." But I can't really tell.
"A garden isn't meant to be useful. It's for joy." - Rumer Godden