It's common for the penis to curve slightly to the left or right when it's erect. Peyronie's disease causes the penis to become curved when it's erect. a curve in the penis when it's erect (usually it curves upwards).
Bent penis: Symptom — Overview covers definition, possible causes of this condition.
Overview. Peyronie's (pay-roe-NEEZ) disease is the development of fibrous scar tissue inside the penis that causes curved, painful erections.