label: familial pityriasis rubra pilaris
label_lc: familial pityriasis rubra pilaris
description: "A rare chronic papulosquamous disorder of unknown etiology characterized by small follicular papules, scaly red-orange patches, and palmoplantar hyperkeratosis, which may progress to plaques or erythroderma. Although most of the cases are sporadic and acquired, a familial form of the disease exists."