Thank you for the replies. It's just worrying. There's definitely a trigger point for the pain, just below the joint on the top of the finger. All around it, nothing when I put pressure, but when I put pressure on that one spot, about the diameter of a pencil eraser, it's like someone is stabbing me with a hot knife right there. But only when I press on it. Weird, right? I'm wondering if it's an inflamed tendon -- I had one of those in my foot a couple of years ago, but this is sharper. That was more diffuse, although there was also a particularly painful spot. But it's a bit to the right of the tendon I can see leading up the finger. It's just so unusual.