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Abstract:
The papulosquamous diseases have certain common morphologic appearances which may at times lead to confusion in diagnosis. They do not have any common etiologic factor. The most common diseases in this category are psoriasis, seborrheic dermatitis, lichen planus, pityriasis rosea, and secondary syphilis. Exfoliative erythroderma is included here since it rarely may be a complication of a pre-existing papulosquamous disease such as psoriasis, seborrheic dermatitis, and lichen planus.