Extramammary Paget's Disease -- Guttate Psoriasis -- Pityriasis Rosea -- Pityriasis Versicolor -- Secondary Syphilis -- Pityriasis Lichenoides -- Mycosis Fungoides -- Erythrodermic Psoriasis -- Pityriasis Rubra Pilaris -- Allergic Contact Dermatitis -- Atopic Dermatitis -- Chronic Actinic Dermatitis -- Cutaneous T-cell Lymphoma (sezary Syndrome) -- Drug Eruption -- Pustular Psoriasis -- Acute Generalized Exanthematous Pustulosis -- Drug Eruption -- Tinea Pedis -- Flexural Psoriasis -- Intertrigo -- Candidosis -- Erythrasma -- Tinea Cruris -- Contact Dermatitis -- Hailey-hailey Disease -- Scalp Psoriasis -- Contact Dermatitis -- Atopic Dermatitis -- Seborrheic Dermatitis -- Nail Psoriasis -- Onychomycosis -- Lichen Planus -- Alopecia Areata -- Contact Dermatitis -- Palmoplantar Psoriasis -- Pityriasis Rubra Pilaris -- Tinea Pedis -- Contact Dermatitis -- Acrokeratosis Neoplastica (bazex Syndrome) -- Lichen Planus -- Darier's Disease -- Porokeratosis of Mibelli -- Juvenile Plantar Dermatosis -- Genital Psoriasis -- Seborrheic Dermatitis -- Contact Dermatitis -- Lichen Planus -- Lichen Sclerosus -- Plasma Cell Balanitis (zoon's Balanitits, Balanitis Circumscripta Plasmacellularis) -- Plasma Cell Vulvitis (vulvitis Circumscripta Plasmacellularis) -- Bowen's Disease -- Erythroplasia of Queyrat -- Extramammary Paget's Disease -- External Ear Psoriasis -- Seborrheic Dermatitis -- Atopic Dermatitis -- Contact Dermatitis -- Otitis Externa -- Facial Psoriasis -- Seborrheic Dermatitis -- Lupus Erythematosus -- Contact Dermatitis -- Atopic Dermatitis -- Rosacea -- Final Comments/conclusion -- References -- Chapter 13: Genetics, Immunology, and Pathogenesis -- Epidemiology -- Etiology -- Genetic Susceptibility -- Environmental Factors -- Risk Factors in Patients with Skin Psoriasis -- Immunology -- Cellular Involvement -- Inflammatory Cytokines -- Other Mediators