extensive focal epithelial hyperplasia: a case report

focal epithelial hyperplasia (feh) or heck’s disease is a rare viral infection of the oral mucosa caused by human papilloma virus especially subtypes 13 or 32. the frequency of this disease varies widely from one geographic region and ethnic groups to another. this paper reports an iranian case of extensive focal epithelial hyperplasia. a 35-year-old man with feh is described, in whom the lesions had persisted for more than 25 years. the lesion was diagnosed according to both clinical and histopathological features. dental practitioner should be aware of these types of lesions and histopathological examination together and a careful clinical observation should be carried out for a definitive diagnosis.