Hi,thanks for writing. Your description suggests that you might have sustained a soft tissue contusion
resulting in hematoma(blood clot) formation. This inturn leads to inflammatory oedema (swelling) along with venous stasis, all contributing to swollen & stiff fingers. I suggest you to
- keep your hand elevated
- active finger movements which will help in resolving the swelling
/ antiinflammatory medications
- Hot fomentation
If all the above measures fail to provide symptom relief ,consult an orthosurgeon and follow his advise. Hope this helps.