This floss is a natural thing that some types of cacti do. They grow fluffy, cottony materials on top.
See here: https://www.google.com/search?rlz=1C1GCEA_enUS761US763&biw=1536&bih=735&tbm=isch&sa=...: or look up
one like "old man cactus".
Thank you! So glad it’s healthy, not infested!
You are welcome. Yes, that is good news!