The red color appears to be sap flushing, as an apple tree wakes up in the spring the flow of sap increases and can cause a slight swelling of the cambium layer in yearling wood which will give a reddish tint through the thin bark layer.
The strange looking mushrooms appear to be puff balls or puff ball like fruits. The single angle doesn't give a lot of detail, so it is hard to make a good determination.
The white mold might be a mold or it could be a fungus, white scale can also look like that but again we only get one view of that portion of the trunk so it is very hard to tell which it might be.
If you can take and post some photos going all the way around the trunk it might be easier to make some determinations ( divide the trunk ground into 4 pieces of pie and one photo from each pie section, close ups would be good too, if you can take them).
The puff balls are really hard now and have dried out. There was one I could open. The inside is like a purple color. If I find a fresh one growing I'll cut it open and post pics. https://photos.app.goo.gl/XOLnlN7zAj7KJ2sh1
yep that is a puff ball, I'd spread those around your gardens, the mycelium is great for trees, shrubs, bushes, even vegetables.
Just smash them and toss them around so the earth mother can water the spores in for you.
Puff balls will eventually form a fairy ring if left undisturbed for a few years.
Their hyphae form very nice fungal highways too.