<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have an open wound on my arm, and Ive been experiencing an elbow lump or mass, elbow swelling and hand or finger weakness. What could be wrong with me, doctor?  <response>: It seems like you have an injury to your radial nerve, which is causing radial nerve palsy. This is a condition in which damage to the radial nerve results in weakness or paralysis of the muscles associated with it, as well as reduced sensation in the arm and hand. 