Suggest Remedy For Pain And Lumps Under Skin In Arm Due To Injury

I fell pretty hard on my arm on a a cut off tree and it was terribly bruised for two weeks The bruising is almost gone now but, it still hurts very bad and I have lumps under the skin. The pain is all the way up my arm now and is not going away. What type of specialist do I need to see? I am 43 years old and a female.