Keratosis: A localized horny overgrowth of the skin, such as a wart or callus. Among the common types of keratosis are actinic keratosis and seborrheic keratosis.

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Keratosis: A localized horny overgrowth of the skin, such as a wart or callus. Among the common types of keratosis are actinic keratosis and seborrheic keratosis.