Keratosis is the term describing a group of non-inflammatory diseases characterized by the thickening of the horny layer of the skin. There are various reasons that lead to relevant types of keratosis. The three most common types are follicular, actinic and seborrheic. There are many other types, most of which are rare or have a hereditary (genetic) in nature.
Banish My Bumps – Get Rid Of Your Keratosis Pilaris by Angela Steinberg