Hi, im 16 and im just wondering if i have a problem here that anyone can tell, along the back shaft of my penis is a dark yet fenit line, running from the top of the skin down to the bottom of the shaft?
Also i have very small pimples, they dont look like a problem, as they are the size of goosepimples, and are sometimes not visible, they are only on the back side of my penis, can anyone help?

Thanks