I have now realized that I develop a small, hard lump on the outermost joint of my thumb. It appears in connection with PMR flare-ups and subsides when the PMR settles down. I showed it to my rheumatologist, but he just made a "sorry you have that" face.
This time, I have a bad and stubborn flare, and the lump is quite large, though not painful.
Does anyone else have this? What could it be?