Coauthored by a rheumatologist and a dermatologist, this handbook provides guidance on the diagnosis, clinical presentation, and treatment of psoriatic arthritis and psoriasis. All available medications and therapies are covered in the book, including a review of their clinical trial data, comparative effectiveness, adverse events, and prescribing information. One purpose of this handbook is to address the educational need for dermatologists who treat psoriasis to detect and refer for treatment psoriatic arthritis, and an educational need among rheumatologists to better understand and treat (or refer for treatment) psoriasis. To this end, this handbook includes a dedicated chapter on how to coordinate management of the two conditions between the two specialties.