In the last year or so I have developed a noticeable curve in my cock. I did a bit of research and discovered something called Peyronie's disease. This is a copy / paste from a medical site giving a brief explanation of it.

"Peyronie’s disease most commonly occurs in men aged 50–60, but it can occur in young men and in old age. The cause is thickening of the fibrous tissue in the penis on one side. This means that, during an erection, one side of the penis cannot lengthen, and the penis will bend. The direction of the bend depends on the position of the thickening (which can often be felt as a lump or lumps when the penis is limp). If the thickening is on the top of the penis, the erection tends to curve upwards; this is the most common type."

It doesn't hurt when it's hard but I can feel the lump in the top of it. It causes me no trouble at all.

I haven't talked to my doctor about it yet but I will take a couple of before and after erection photos for him to see. These photos were taken on Dec 16/16 and Dec 6/15

Update June 25/18
I have seen a urologist and he said that if it's not painful or causing any problems it's best just to leave it be so I will. I was happy to show him four time lapse photos of it's progress.