Peyronie's disease is a patch of scar tissue, called a plaque, in the sheath that surrounds the erectile tissue. Scar tissue doesn't stretch, so the erection bends toward it. It isn't cancer, it isn't an infection, and it isn't caused by anything you should feel ashamed of.
It moves in two phases. The active phase, typically the first 6 to 18 months, is when the curve can change and erections may hurt. After that most cases stabilise. What makes sense to do depends entirely on which phase you're in, which is why measuring matters more than guessing.
Honesty first: a mild, stable curve that doesn't interfere with sex may need no procedure at all. Correction is a conversation for curves that have stopped changing and still get in the way. And because the plaque can affect blood flow, erection problems often overlap, so we assess both together.