Pityriasis rubra pilaris: evolution of challenges in promising treatment options.

Pityriasis rubra pilaris is an uncommon inflammatory dermatosis that is well recognized across the globe. Erythroderma is a common presentation. A precise diagnosis of pityriasis rubra pilaris is based on morphologic features and is classified into 6 types: classic adult onset (type I), atypical adult (type II), classic juvenile (type III), circumscribed juvenile (type IV), atypical juvenile (type V), and human immunodeficiency virus-associated (type VI). Several conventional systemic and/or topical treatments are currently in use. Largely, their results are unsatisfactory and limited by long-term toxicity. The authors investigate the efficacy of a wide spectrum of drugs by examining historical (archive) and promising (modern) treatment modalities for the treatment of pityriasis rubra pilaris.