

I don’t think you’re supposed to use any kind of alcohol on woody trunks of plants, but maybe I’m wrong there.
It just looks like a deadened growth that will turn into a knot. Unless you see it spreading, I don’t think there is any cause for concern, especially if it’s an indoor plant.
Fungus or mold usually has color, and dead growth is brown or black like this.











You never mentioned you were trying to mount live files or your home directory…that’s an entirely different thing.
Yes, it does matter.