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Nevus verrucosus Acanthosis nigricans 1. Orthokeratosis compact 1. Orthokeratosis in basket-woven and lamellate patterns 2. Thick epidermis, either papillated or digitated 2. Thin epidermis 3. Hypergranulosis usually 3. Granular zone normal or slightly decreased in thickness 4. Epidermis sometimes hyperpigmented 4. Epidermis consistently hyperpigmented 5. Projections of elongate dermal papillae above the skin surface, but […]