Ok, don't just read the first sentence of this post and let it scare you from reading the rest...lol... Annyyway, I was on the shitter today, and as i was taking care of business, I looked down at my cock and saw what appeared to be a stretch mark. Now I'm not totally sure if it IS infact a stretch mark, but it looks exactly like one...and I'd know first hand. I used to be a pretty thin guy, and then started lifting weights and eating like a bodybuilder would, and have gained a significant amount of muscle over the past 3 years. These rather quick gains of mass have caused stretch marks to occur on my arms, armpits, and chest. And when I saw my penis today, it looked like the same thing on my penis...granted it was flaccid and I'm on the "grower" side, it was toward the base of my cock. So my question to anyone here would be: has this happened to anybody? Is it common/rare and at what age did it happen? This COULD just be a mark from the pants i was wearing today, so I'll check in tomorrow and let you know if it's still there, but from the looks of it, i really think it might be a stretch mark. Thanks in advance for any replies