Pityriasis rubra pilaris (PRP) is a rare papulosquamous disorder of unknown origin. Although PRP usually resolves within 1 to 3 years,1 treatment of the disease is generally difficult. Encouraged by good results with extracorporeal photochemotherapy (ECP) in patients with erythroderma of other origin,2-4 we treated 2 patients with erythrodermic PRP type I using ECP in combination with systemic retinoids and cyclosporine, respectively.