This summer, I noticed a bump on the shaft of my penis. When I touch it is like a miniature bean..not too hard and not too soft. It looked like a pimple because it had a white head, but when i squeezed it, it pierced the skin and popped out! It was black and beige and small. Recently, I found two more on the shaft of my penis and two on my testicules. They are the same things because when i squeeze them, the skin opens a little and the mini bean things try to pop out. What could this be?