I haven't been following this thread for a while, however I just noticed the subject got changed to Dupuytren's contracture. I had this problem on both hands. I was told it could be heredity, but I'm not aware of anyone in my family having it, and I don't have northern Euro heritage.
Sorry I'm making a story out of this. Back in July 2015, after coming back from a fishing trip in Ontario, Canada, I showed a friend a picture of a 36 inch Northern Pike. He had noticed in the picture my middle finger was bending up as I was holding the fish, Well, that ruin the whole picture. It had to be fixed, so shortly later I had surgery. It was too far bent for any alternative procedure. Surgery was back in August 2015 as outpatient. It's been almost four years now, with no signs so far of recurring. There's no hard lump in my palm of my hand, and my finger is straight as can be.
In April of last year I noticed that a finger in my other hand was starting to bend. Knowing what it was, I was contemplating calling the doctor. Well, while I was out for a run, I fell and fractured my wrist. The bent finger was on the other hand. Now I had a reason to see a doctor. While I had an appointment for my wrist, I showed him my bent finger. It turned out I had alternating office visits for each problem.
Since I caught the bent finger issue earlier then the first time, surgery was not required. Instead I had in-office Enzyme (XIAFLEX) Injection. The following week I returned for manipulation of palmar cord. This is a procedure wear the doctor pulls back on your fingers to break the protein (Collagen) formation in the palm of my hand. We were to hear a pop. Well that didn't happen. Couple days earlier I was doing my thing in the Pines. If you remember, there were strong winds at that time that caused many trees to come down. I was out in the Friendship Bogs where many trees had fallen across the dike. The only way to get by was to crawl under, climb over, or bust through. By doing that I think I already had popped the formation. With this procedure, the lump does not go away, but I've been with a straight finger for a year now.