@bonnieh218 I didn't notice this discussion before this morning, but I just had a mucous cyst drained by my dermatologist. He said they often recur and if they become problematic then I could go to a hand surgeon and have something done to prevent them from recurring. I do not have arthritis in my hands or fingers at all, which I realize is often a cause.

@u13496 My doctor did refer to them as being "mucous cysts". I just googled synovial cyst and I believe that is not quite the same, although it could be.

I took this picture of my mucous cyst to send via the portal to the dermatologist to ask if he could do something about it, so here's the picture. I wish this website didn't feel the need to make the picture so much larger, it makes it quite blurry.
JK