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A group of rare genodermatoses characterized by keratotic follicular papules, variable degrees of inflammation, and secondary atrophic scarring. Most cases are associated with an atopic diathesis and keratosis pilaris on the extensor extremities. KPA is comprised of three distinct clinical subtypes: keratosis pilaris atrophicans faciei, atrophoderma vermiculatum, and keratosis follicularis spinulosa decalvans. Affected individuals may present with features overlapping the 3 subtypes.