Focal acral hyperkeratosis (also known as "Acrokeratoelastoidosis lichenoides," and "Degenerative collagenous plaques of the hand") is a late-onset keratoderma, inherited as an autosomal dominant condition, characterized by oval or polygonal crateriform papules developing along the border of the hands, feet, and wrists.[1]:509
It is considered similar to Costa acrokeratoelastoidosis.[2]