Okay, that helps. It could be hyperpigmentation from past inflammation or injury. They don't hurt, crust, etc? The GUM clinic would have been able to identify them if they were warts or anything dangerous.
That's what is so great about this format. You can literally ask anything and it's anonymous and nothing is embarrassing here. Nothing to apologize for either, that is what this forum is for.
Discoloration on your penis. Are these discolorations dark? And they aren't new, correct? No other symptoms? It would really help to further discuss if we knew if they are dark or light.