Margellon [ARRELL post, revised]
[repost has deleted an unnecessary insult from the end of the post; includes all information as included in original; adds citation and link missing from original post -- MA]
The 'disease' from wikipedia:
Morgellons shares characteristics with a number of recognized medical conditions, including attention-deficit disorder, chronic fatigue syndrome, Lyme disease, obsessive-compulsive disorder, but especially with delusional parasitosis, a mental illness involving false beliefs about infestation by parasites.
The Journal of the American Academy of Dermatology printed two letters, and a commentary on them, in its November 2006 issue. Their consensus was that dermatologists should humor patients who think they have "Morgellons disease", but treat them for delusional parasitosis. [2][3][4]. The National Institutes of Health Office of Rare Diseases presently links their entry on Morgellons[5] to the CDC's page on delusional parasitosis. Morgellons has been succesfully treated with the antipsychotic medication Pimozide[6], which has been used to treat delusional parasitosis.
["Morgellons" article available at http://en.wikipedia.org/wiki/Morgellon. -- MA]