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Introduction to Psoriasis and Scaling Diseases

by Peter C. Schalock, MD

Psoriasis (see Psoriasis), parapsoriasis (see Parapsoriasis), pityriasis rosea (see Pityriasis Rosea), pityriasis rubra pilaris (see Pityriasis Rubra Pilaris), pityriasis lichenoides (see Pityriasis Lichenoides), lichen planus (see Lichen Planus), and lichen sclerosus (see Lichen Sclerosus) are dissimilar disorders grouped together because their primary lesions have similar morphologic characteristics: sharply marginated, scaling papules or plaques without exudates, crusts, or fissures. Lesion appearance and distribution distinguish these diseases from each other.

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