Snow mold, damage should be superficial. There are some vendors that buy plants from growers in Hawaii that grow in shadehouses and you can get snow mold that way.
You could do a little dip in fungicide of your choice, let dry out and repot in a fresh media then keep dry for a couple of days, clean tag and pot with isopropyl/water mixture. That should take care of it.
Alternatively you could introduce beneficial organisms into the media to push out the bad fungi.