Apparently San Francisco is a hotbed:

The disease sounds like a nightmare. In fact, one Web site claims Morgellons was “invented” recently to help promote a summer horror movie. A search on the Internet reveals dozens of people who have posted magnified photos of their symptoms — usually twisted, thread-like protrusions from the skin and sometimes hazy images that look like small bugs.

It doesn’t help convince disbelieving doctors that many sufferers complain of hard-to-believe symptoms. One San Francisco woman describes “tiny green shrimp” that come from her face, and she said she saw a fly pop out of her right eye. Even doctors and patients who believe Morgellons exists cringe at such reports.