It presents itself in the mouth, most frequently as a thick, bilateral, symmetrical<unk>  plaques with a<unk> , corrugated or velvety texture. Most usually, the lesions are on the buccal mucosa, but sometimes on the labial mucosa, alveolar ridge, floor of the mouth, ventral surface of the tongue or soft palate. The gingival margin and dorsum of the tongue are almost never affected. Less commonly, sites outside the mouth are affected, including the nasal, esophageal, laryngeal, anal and genital mucosae. It usually is present from birth, or develops during childhood. Rarely, the lesions may develop during adolescence. Apart from the appearance of the affected areas, there are usually no other signs or symptoms.
White sponge nevus
Eccrine nevus
Melanocytic nevus
Halo nevus
Dysplastic nevus
Connective tissue nevus
Hydrocarbon keratosis
Arsenical keratosis