A white, spongy, non-ulcerated lesion on the floor of the mouth. Most likely diagnosis?

WHITE SPONGE NEVUS: bilateral, white, spongy, thickened oral mucosa (floor of mouth, buccal mucosa) — autosomal dominant, benign, non-ulcerated. SCC = indurated, ulcerated, fixed. Leukoplakia = flat white non-wipeable patch. Candidiasis = wipeable pseudomembranous or red.