I had a compound harline fracture in my right arm a while back. It hurt like a mother to do curls. It could be minor tendonitis. You may be able to just out train it, but I would advise seeing an orthopedic doctor as he is better suited to meeting your needs than some random dude on the internet.
Try RICE and then if it doesnt go away or is severley hurting (7 or greater on a scale from 1 to 10) then you should seek professional advice.