Tabriz University of Medical Sciences Journal of Dental Research, Dental Clinics, Dental Prospects 2008-210X 3 2 2009 06 01 White Sponge Nevus: A Case Report 70 72 EN Amirala Aghbali Firouz Pouralibaba Hossein Eslami Farzaneh Pakdel Zahra Jamali Journal Article 2009 02 28 2009 04 14 White sponge nevus (WSN) is a rare hereditary dyskeratotic hyperplasia of mucous membranes. It is an autosomal dominant disorder with variable penetrance. We report a case of WSN in a healthy 21-year-old male with no history of familial involvement. A white smooth plaque with no erythema or other structural abnormalities was observed, which confirmed the diagnosis of WSN histopathologically.