Psychogenic parasitosis. A case series and literature review.

About 100 years ago, psychogenic parasitosis was first described in the literature. This peculiar symptom may complicate medical and psychiatric conditions or indicate the presence of a delusional disorder (somatic type). By using the authors' case series of 12 patients, which are reported in the article, and a review of the literature, an historical perspective and the authors' clinical orientation to evaluation and treatment of psychogenic parasitosis are presented.