What is white sponge naevus?

White sponge naevus (Mendelian Inheritance in Man [MIM] number 193900) is a rare genetic condition that causes white spongy lesions of the mucous membranes, most commonly the mouth. It has also been called congenital leukokeratosis, mucosa oris, hereditary leukokeratosis, white folded gingivostomatitis, oral epithelial naevus and oral white sponge naevus.

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Source: dermnetnz.org