Peyronie disease is a connective-tissue disorder of the penis characterized by the formation of fibrous plaques within the tunica albuginea—a tough, elastic layer surrounding the erectile tissues (corpora cavernosa). These plaques prevent the penis from expanding uniformly during an erection, leading to curvature, deformity, and often pain. While the disease is benign and non-cancerous, its psychological and sexual impact can be profound.
Source: https://www.dotclinics.pk/peyronie-disease