Abstract
Pityriasis rubra pilaris is an uncommon papulosquamous inflammatory dermatosis with an etiopathogenesis still insufficiently known. There are six subtypes that differ from each other by the age of onset, the distribution and morphology of the lesions, the natural evolution of the disease and the association with HIV infection. Type I is the most common form in adults, while types III and IV are the most common in children. The following clinical manifestations are described in all subtypes in varying proportions: follicular hyperkeratosis, scaly orange-red plaques and palmoplantar hyperkeratosis.
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