Hi, Now my age is 30. When i was on teen age, i found a small brown/black spot on the bottom of my penis head. Initially i tried a fungal cream once or twice and stopped it, because of irritation. Now its been almost ten years, the size of spot has grown may 1cm in width and height in this ten years. I dont have any itching, irritation, redness or pain in that area. What could it be? Please assit me.