Why does the penis curve?
In Peyronie’s disease, the normal elastic tissue of the tunica is replaced by scar tissue. Normally with erection the elastic tissue of the penis expands and elongates symmetrically resulting in a straight erection. Because the plaque, or scar tissue, is not elastic, but rather hard, it will not stretch with erection. The disease starts as a small bump or constriction on the shaft of the penis below the skin, which expands to form a flat deposit that’s sometimes as large as the diameter of a silver dollar. This “plaque” invades and replaces the elastic covering of the penis with inflexible material. When a man with Peyronie’s has an erection, the plaque does not expand, so the penis curves to one side.
