Still, if I'm wrong, and you know something about nose picking, then by all means, write away!
Some hints: * The journal of Clinical Psychiatry, Vol. 62, p. 426-432 * The journal of Clinical Psychiatry, Vol. 56, p. 56-59 (Sorry, I only have the German titles of the articles.)
You might also want do make a google search for "Rhinotillexomania" (333 hits!).
Have fun!
Kurt