Joni Mitchell herself believes in medical misinformation and pseudoscience. She claims to have Morgellons. Morgellon's is a "self-diagnosed, scientifically unsubstantiated skin condition in which individuals have sores that they believe contain fibrous material."
"Its presentation is very similar to delusional parasitosis, with the addition that people with the condition believe there are inanimate objects in their skin lesions. An active online community supports the notion that it is an infectious disease, disputes that it is psychological, and proposes an association with Lyme disease. Controversy has resulted; publications "largely from a single group of investigators" describe findings of spirochetes, keratin and collagen in skin samples in small numbers of patients; these findings are contradicted by much larger studies conducted by the CDC, which found skin samples mostly contained cellulose that came from cotton, with no evidence of infection or other causes." (Emphasis mine)
“Dr. Marc D. Feldman, a psychiatrist and specialist in Factitious Disorders, said he believes that Morgellons is an example of “mass hysteria,””