melanocytic nevus White sponge nevus UMLS:C4011926 Any hereditary mucosal leukokeratosis in which the cause of the disease is a mutation in the KRT4 gene. WHITE sponge NEVUS 1 white sponge nevus 1 hereditary mucosal leukokeratosis caused by mutation in KRT4 White sponge Nevus of Cannon KRT4 hereditary mucosal leukokeratosis WSN1 White sponge Nevus type 1 OMIM:193900 leukokeratosis, hereditary mucosal Genetic skin tumor