What Is The Treatment For Pain And Swelling In Wrist And Knuckles?

Hello, I started a new job in an automotive factory 3 days ago. This job requires repetitive hand movements for assembly. I was stretching my wrist and fingers in an effort to relieve some of the stiffness. I believe that I may have pulled too hard and fractures a bone in my hand. I have swelling on top of my hand between the wrist and knuckles. There is a hard bump in one place. The swollen area has some discoloration to it. The pain is tolerable, but the swelling is causing difficulty. What would you recommend for treatment? Can this kind of injury heal safely on its own? Thank you for taking the time to answer my question.