Abstract
Papulosquamous disorders comprise a group of dermatoses that have distinct morphologic features. The characteristic primary lesion of these disorders is a papule, usually erythematous, that has a variable amount of scaling on the surface. Plaques or patches form through coalescence of the primary lesions. Some common papulosquamous dermatoses are pityriasis rosea, lichen planus, seborrheic dermatitis, tinea corporis, pityriasis rubra pilaris, psoriasis, and parapsoriasis. The etiology, diagnosis, and treatment of pityriasis rosea, lichen planus, and seborrheic dermatitis (including seborrheic dermatitis associated with AIDS) are discussed in this chapter. Also discussed are the diagnosis and treatment of pityriasis rubra, parapsoriasis (pityriasis lichenoides and small- and large-plaque parapsoriasis), and erythroderma. This chapter includes color photographs of the aforementioned dermatoses plus the Koebner phenomenon, lichen planus of the mucous membranes, and erythroderma in Sézary syndrome. This review contains 11 highly rendered figures and 79 references.
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