Question about Penis Cuts

Ok so ive had this cut on the tip of my penis, kind of like a puncture for three years now, at first it was painful(when I urinate) but at this date it does not hurt at all. I masturbate daily, there is no blood though, probably the reason why it wont heal, but i've stopped for 18 days now, I want to know what is the average healing period for it, im not really sure if its improving. 

How did you get the cut, how long/deep is/was it, and have you ever seen a doctor about it?

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I think I got it from my pants being tight and it being erect, one day I came home and when I urinate I felt extreme pain in that area, on closer inspetion it was scratch or opened. Have not seen a doctor about it.

If you've had it for three years, and it still hasn't healed, then it probably never will, and you should see a doctor.