hello, I am concerned about an unusual and off colored bump on my penis shaft. It is just a soft bump. You know when regular color of the penis skin is pink, this spot or bump is a little darker color, like redish brown. It doesn't hurt at all, and its been there a while. As far as I know, the unusual bump has stayed the same size, neither growing or shrinking. Just a little concerned about what it it. Any help would be appreciated, thanks.