Someone just recently had mentioned what was probably this critter as causing a rash-like condition requiring treatment. I was suprised that most people apparently have Demodex living on or in the pores of their faces, but only a few have serious reactions to them. A line of products put out by FaceDoctor is puportedly designed to treat such a problem. If you Google FaceDoctor, you'll locate their Web site -- probably something like http://www.facedoctor.com

YouTube has a video of what is likely some other kind of minute worm 'infesting' someone's face -- definitely rather unpleasant to contemplate:

http://www.youtube.com/v/GiHtUFuGgSA

It's quite amazing what we are vulnerable to!