I Got Hit Pretty Hard With A Baseball On My

I got hit pretty hard with a baseball on my shin, and immediately got a bruise, it was not bothering me until I hit it again a few days later, I bruised it pretty bad and still am limping here and there. It sometimes stings, or burns and swells right up. And I will feel a sharp pain once in a while. What can be done to stop this or what diagnosis can you give? It is very sensitive to touch and once we touch it slightly the bruise gets darker and very painful