Between the ages of about 38 and 46, I had a continuous rash on my forearms, elbow to wrist, which moved around every day. I'd get intense itching in an area the size of a quarter. The next day it'd be an inch away. It wasn't
Morgellons exactly, because there was never any hint of fibers, but some of the symptoms were very similar. Was it delusional? Didn't feel or act like it.
Over the course of 6-8 years it eventually migrated all over both forearms (upper side only). Then as suddenly as it appeared it disappeared, and has never returned.
No treatment ever made a difference (pills, creams, sprays). A half dozen doctors found no cause. I changed laundry detergents more than once. Clothing made no difference (other than long sleeves causing irritation). Ice would usually quell the itching temporarily, but it came back as soon as the skin warmed up again.
The only evidence it left behind is that the affected areas do not tan. In the summertime my arms look extremely mottled, with thousands of small white spots covering my forearms. As I have aged, this mottling has become more pronounced, to where you can now see "old man skin" on my forearms year-round.
I still have no idea what it was.