[DouglasKC]

You know what this stuff sounds like? Artillery, or shotgun fungus. It normally grows in landscape mulch and shoots small black pepper grain sized spores at light sources. It can shoot these spores up to twenty feet. Landscape mulch is very frequently used around home. The spore adheres, attaches, itself with a substance that is stronger than superglue.

I can imagine that what is happening is that people have this fungus in their mulch around their house. The fungus will shoot it's spore toward a light source, perhaps an open window, and then it may land on a person. You probably wouldnt' notice it much, but it would feel like perhaps bugs crawling on you as it grew. On skin it might appear to be small freckle or blackhead at first but if it grew, it would become fibrous.

A picture of the fungus:

Another view:

Fungus on siding:

More info:

Shotgun fungus

Artillery fungus

[visualops]

That's very interesting, however they do say it's not a problem for pets so one would have to assume the spores only survive under certain conditions. I am glad I always use cypress mulch though!