Parasitosis:
A parasitic disease, also known as parasitosis, is an infectious disease caused by parasites. Parasites are organisms which derive sustenance from its host while causing it harm. The study of parasites and parasitic diseases is known as parasitology. Medical parasitology is concerned with three major groups of parasites: parasitic protozoa, helminths, and parasitic arthropods. Parasitic diseases are thus considered those diseases that are caused by pathogens belonging taxonomically to either the animal kingdom, or the protozoan kingdom. [Wikipedia]
As expected. Noted in “What Happened to Chemtrails?” Mick West, Skeptical Inquirer (January/February 2024, paywall):
Morgellons was a self-diagnosis that a few worried people sought out when their regular doctors were unable to cure their symptoms. It involved small fibers that were thought to emerge from the skin as part of the “disease.” In reality, the fibers people were finding were ordinary misidentified things such as hair, cotton, or paper fibers. But the visual confirmation of their suspicions seemed to be something people latched onto.
The Morgellons community was very diverse. While most had genuine symptoms of unknown cause, their fixation on the “fibers” as being related made their condition indistinguishable from delusions of parasitosis. It was a very eccentric community.