The underlying cause of<unk>  is unknown. Although, it is likely due to a buildup of plaque inside the penis due to repeated mild sexual trauma or injury during sexual intercourse or physical activity. Risk factors include diabetes mellitus, Dupuytren's contracture, plantar fibromatosis, penile trauma, smoking, excessive alcohol consumption, genetic predisposition, and European heritage.
Peyronie's disease
Blount's disease
Minor's disease
Reis–Bucklers corneal dystrophy
Darier's disease
Sorsby's fundus dystrophy
Meesmann corneal dystrophy
Fundic gland polyposis