I would like to add something about that, over the course of about six months I was able to increase the thickness of my hands as a whole and specifically the tips of my fingers. I went about it in essentially the same was as PE and did it in conjunction with PE. I had a slab of granite placed at navel height level in my house, warmed my hands with the hottest water I could stand for 5 minutes and starting lightly pounded my hands and fingertips into the granite conditioning them over time. I would do this with my hands then warm them again and do my PE routine at that time. Bonus my heated up hands helped to keep my member warm when performing manual jelqs.
I did this with my hands as if I were doing iron fist kung fu training. Anything is possible with the correct allocation of intelligence and resources, and changing the size of your dick is no different. Good luck to all!!