melanocytic nevus hereditary mucosal leukokeratosis https://github.com/monarch-initiative/mondo/issues/6877 https://www.malacards.org/card/white_sponge_nevus white sponge nevus UMLS:C1721005 MONDO:0015748 MESH:D053529 GARD:0008501 SCTID:389203001 Orphanet:171723 White sponge nevus (WSN) is a rare and autosomal dominant genetic disease in which the oral mucosa is white or grayish, thickened, folded, and spongy. The onset is early in life, and both sexes are affected equally. Other common sites include the tongue, floor of the mouth, and alveolar mucosa. DOID:0050448 MEDGEN:328433 NCIT:C84760 white sponge nevus of Cannon White sponge nevus of Cannon ICD9:528.6 hereditary mucosal leukokeratosis OMIMPS:193900 hereditary skin disorder