I have a mole near or almost in the urethra of my penis. I have had this since I was a teenager. I am now 32yrs old. I have only recently become aware of melanomas and I've read the ABCDE's of it. I have found however that this mole of mine is both asymmetrical and does not have any defined border. It doesn't seem to be growing though. I've had this for around 15yrs I think. Should I be concerned?