Tried translating this germn image
Basically top left is important. The foreskin is a thin piece of meaty tissue with skin on the outside (colored orange) and also with skin on the inside (colored pink). The outer skin of the foreskin connects to the shaft skin. I marked in black where it's amputated. This is why circumcized men have this weird color near the glans, it's the remnant of the inner foreskin skin that is left.