This concise handbook looks at psoriasis and psoriatic arthritis as separate but often related conditions, focusing on a background around the indications, such as disease overview and epidemiology; going on to look at the etiology and immunopathogenesis of each indication; looking at the clinical presentation and diagnosis; before focusing on the current and emerging treatment options, including a brief section on the issues of quality of life and comorbidities associated with these indications. ​