Does anyone now what a long term impact wound is called and what they would do?

In december last year I fell onto the bedside table and developed an impact wound. The lump is still there so I am planning on going to the doctors. Sometimes it bruises sometimes it doesn't but it is constantly there. Of course the cut healed up a long time ago.

Has anyone had something like this? Do you know how it would be treated? I don't really like going to the doctors very much so I would like to know a bit more before I go. It doesn't hurt anymore unless I go to the gym... hence why I am going because I have put on weight since I haven't been able to go to the gym with out pain in my leg. Ocationally I can feel it pulsing.

I know I should be going to the doctors and not asking on here, which I will do. But any experiances with this type of injury would be apreciated.