Warty hyperkeratosis is typically rough-looking and white. Proximal and lateral nail folds affected. Treatment is difficult and must be gentle enough not to scar or damage the nail matrix.

Multiple rough, flesh-colored papules grouped around the proximal nail fold. Biting this area is discouraged, as it may spread the warts to other areas, such as the lips or nails.

Wart treated with liquid nitrogen. A rim of normal skin is also treated. The white freezing color change should remain 15 s and be allowed to slowly thaw; often the lesion is treated twice.