pityriasis /pit·y·ri·a·sis/ (pit″ĭ-ri´ah-sis) any of various skin diseases characterized by the formation of fine, branny scales.
pityriasis rubra pilaris
pityriasis al´ba a chronic condition with patchy scaling and hypopigmentation of the skin of the face.
pityriasis ro´sea a dermatosis marked by scaling, pink, oval macules arranged with the long axes parallel to the cleavage lines of the skin.
pityriasis ru´bra pila´ris a chronic inflammatory skin disease marked by pink scaling macules and horny follicular papules, beginning usually with seborrhea of the scalp and face, with keratoderma of palms and soles.
pityriasis versi´color tinea versicolor.
pityriasis rubra pi·lar·is (p -lâr s)n. A chronic eruption of the hair follicles, which become firm, red, surmounted with horny plugs, and often form scaly patches. |
pityriasis rubra pilaris
Etymology: Gk, pityron, bran; L, ruber red, pilus, hair
a chronic inflammatory cutaneous disease characterized by tiny acuminate, reddish brown follicular papules topped by central horny plugs in which are embedded hairs; disseminated yellowish pink scaling patches; and often solid confluent hyperkeratosis of the palms and soles with a tendency to fissuring.
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