hi, about 2 years ago i got bitten by a dog on my left arm it was swollen and black and blue and painful and itchy for weeks. eventually the swell-en went down but still itchy and painful for a while it came and go then i notice a lump right there which is tender when I touch it. the itchiness and pain has stop but the lump is still there and tenderness is as well should i be concerned is it cancerous of this lump. In the begging i felt like i had nerved damage. What should i do?