I am 28 years old. Male. Firstly, I am having an erection problem for last 4-5 years which started all of a sudden. Previously(1-2 yrs back) sometimes I used to have proper erections. But now it never gets fully erect. Its not that firm which it used to be. Secondly, a black patch gradually appeared on the the corona and now getting bigger in size. And also a slight black patch is there on the shaft near where the corona starts. It seems some of the veins have dried up. I have shown it to a urologist 1 month back. My testosterone level is ok. But fsh is low. The doctor gave me himcolin gel. But it hasn't helped me. Please help. Thanks.