Pruritus - Itching (Subscribe)
Links
Invisible Itches: Insect and Non-Insect Causes
http://www.ca.uky.edu/agc/pubs/ent/ent58/ent58.pdf
Article about biting arthropods and other causes of irritations of unknown origin.
http://www.ca.uky.edu/agc/pubs/ent/ent58/ent58.pdf