Injury or surgery can initiate Dupuytrens.
I injured my left hand 8 weeks ago and have been fighting the tendency of one finger to curl inwards. I am due to see the therapist again in a week, but scar tissue grows 24/7 and it cannot be left to its own devices that long.
Four/five times a day I am stretching the finger, sometimes under hot water, and massaging the palm vigorously with a wooden roller. The therapist would rather I were exercising every hour, but somehow life gets in the way.
However, when I sit down in the evening I lean on the hand with a heavy weight to make it flatten for a couple of hours.
I have also ordered a hand split, this one, https://www.amazon.co.uk/Apasiri-Metacarpal-Straightening-Immobilizer-Tendonitis/dp/B0CDBZG55F/ref=asc_df_B0CDBZG55F which I am going to wear on top of the hand, not underneath as shown, so that the finger is stretched overnight.
I am wearing Coban https://www.medisave.co.uk/products/3m-coban-self-adherent-bandage-skin-tone-2-5cm-x-4-5m-5 stretch bandage to expel the swelling. Initially I wore it at night, but now also during the day, other than mealtime for hygiene reasons.
It's annoying to have this complication, but I hope that with some bloody-mindedness, it can be defeated.