The new second edition of the Handbook of Psoriasis remains an easy-to-read but detailed text on a common skin disease which affects 2% of the world's population. The text is designed as a reference for both the specialist and the primary care physician and can be read cover-to-cover in a week. Each chapter stands alone as a reference to a specific topic but is clearly cross-referenced to offer a more detailed perspective. This new edition runs the full gamut from pathogenesis to clinical variants of psoriasis to individual treatments with emphasis on standard protocols. Each chapter has been carefully updated to reflect developments in the last five years and new chapters cover such topics as childhood psoriasis, psoriatic arthritis and biologic immunotherapy.