It's thought that inherited traits may play a role in who is susceptible to the disorder.

CNN: Peyronie's disease

No one knows what triggers the disorder, but stress and skin infections seem to play a role.

FORBES: Skin Deep

In 1997, Casey Martin, a professional golfer with a circulatory disorder, sued under the American with Disabilities Act to be allowed to use a golf cart to play in the U.S. Open.

CNN: Oscar Pistorius, an inspiration and a question