Papulosquamous cutaneous diseases are a loosely defined category of dermatoses bound together by the fact that they all present clinically with scaly plaques and papules. In many cases, their exact etiologies are unknown. The major disease entities falling into this category include psoriasis, ‘para - psoriasis’, pityriasis lichenoides et varioliformis acuta (PLEVA), pityriasis lichenoides chronica (PLC), lymphomatoid papulosis, pityriasis rosea (PR), pityriasis rubra pilaris (PRP), pityriasis alba (PA), lichen planus (LP), lichen striatus (LS), lichen nitidus (LN), and seborrheic dermatitis (SD). Some clinicians also include xerosis, acquired icthyosis, and asteatotic dermatitis, especially in human immunodeficiency virus (HIV)-positive patients.
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