I have a strange bump on the side of my knee. At first i thought it was a wart but i have used compound w on it and it did not go away. It is about the size of a pencil eraser, slightly raised, and white. I took a picture of it, if it would help. I am trying to identify it and get rid of it, whatever it is. It has been there for at least 5 months now. Any help would be appreciated. Thanks.