In Peyronie's disease, problems in the normal wound-healing process result in permanent scar tissue.

CNN: Peyronie's disease

In some men, Peyronie's disease comes on gradually and doesn't seem to be related to an injury.

CNN: Peyronie's disease

The cause of Peyronie's disease isn't completely understood, but a number of factors appear to be involved.

CNN: Peyronie's disease

Researchers are investigating whether Peyronie's disease might be linked to immune system disorders.

CNN: Peyronie's disease