I am uncircumsized and i have a raised, visable line that goes from my scrotum to the top of the foreskin on the underside of my penis. It is slinghtly curved and feels raised to the touch. It is like this when i am erect and flaccid. Please, could someone tell me what this is?
I think what you are referring to is called a raphe. It's the "seam" made when your scrotum and penis were forming. Just like that little divot between your nose and lip, it's the place where two growing parts of tissue met and sealed together.
I've seen what you describe in porn too. Some guys have it as noticeable as yours.
Raised line down bottom of my penis 
Your post is right on.
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