Psoriasis is a common chronic hyperproliferative inflammatory disease that affects skin, nails and joints. In this book, the authors present current research in the study of the types, triggers and treatment strategies for psoriasis. Topics discussed include keratinocytes in psoriasis; keratin 17(K17) as a targeted therapy in the treatment of psoriasis; narrow-band ultraviolet light B (UVB) and psoralen plus UVA effect in the circulating levels of biological markers in psoriasis; comorbidities and nutrition in psoriasis; cardiovascular disease and psoriasis; and psoriasis vulgaris investigated by electron paramagnetic resonance.