Has anyone experienced a reduced range-of-motion in a finger due to what appears to be growth of tissue within the a joint?
I can no longer fully flex the 2nd joint of my pointing finger. I have a small dimple in my palm at the base this finger, along with a small nodule in the web between this finger and my thumb. There is no apparent swelling or tenderness of the joint, and there is no pain unless I try to force the finger to my palm. It has simply become more limited in its range over the last year or so.
As opposed to normal DC, I can extend it fully, but I cannot contract it fully to make a fist. I do not think it is arthritis.

George, Eddie,
George's experience is not dislike mine in the start. I had the "dermal pits" which were obvious DC (although I didn't know it at the time). But when I noticed the change in skin and a little stiffness in the joint was when I needed to get it checked. I also had no pain.
I agree with Eddie, to get it checked and don't get in any hurry to have something done. It might not go further than the present condition. You don't want to do anything to stimulate growth.
Keep in touch. Let us know what you determine.
Gary