Why Is Penis Color Dark?

Hi. I am fair skinned guy and 26 years old, and I have realized that the color of my penis has become much darker than what it used to be. I have also been masturbating frequently for the past 3-4 years. Now, I am trying to not to engage in such a behavior on frequent basis. However, is there a way to bring the color of my penis back to it's original color, or make it much lighter than what it has become now? Please advise. Thank you. -