Really bad arm and knuckle injury please help?

Ok so me and my friend were playing a game where you take it in turn to hit eachother in the arm (stupid i know) and now my upper arm (bicep tricep area) is really pinky red and has swelled up alot and i can bearly move it, and from one of my punches well it went wrong and now the knuckle on my little finger is really hurting and i can bearly move my little finger any solutions to these please??