I have a discoloration on the underside of my penis that goes in a line that covers a fair amount of the underside of my penis. Its red where my balls meet the shaft, and then is a kind of blackish blueish up till where the line stops right before the head of the shaft. I feel no discomfort from it, and have had it for a while. There is also a very little blackish blueish marks where my legs meet the balls, not that much at all though. Im not sure what to do, I do fear cancer b/c of things I've read about discoloration. Someone help me please, I'm very nervous and scared. If you need to know anything else, please contact me.