The term "Morgellons" is a name that a lot of people use for an already established condition. The condition is called Cutaneous Vasculitis. This particular one is caused by a Bartonella infection.

https://rarediseases.org/rare-diseases/cutaneous-vasculitis/

"Cutaneous necrotizing vasculitis (CNV) is characterized by inflammation and tissue damage (necrosis) of blood vessel walls (lumen) and associated skin (cutaneous) lesions. "

Bartonella operates genetically and causes a lot of cellular mutations. The fibers are caused by a mutation of an existing cell fiber.

https://nbprotocol.proboards.com/thread/273/fiber-production-skin

"Fiber production in the skin"

It can be treated but not with antibiotics or antipsychotics