HISTORICAL PERSPECTIVE
The term “erythroderma” was introduced in 1868 by Hebra to describe an exfoliative dermatitis involving more than 90% of the skin surface. Based upon the clinical course, erythroderma was classified into chronically relapsing (Wilson–Brocq), chronically persisting (Hebra), and self-limiting epidemic (Savill) variants. However, these subdivisions are no longer employed. Even though originally more strictly defined as erythema and scaling involving >90% of BSA, nowadays the term erythroderma is often more liberally applied when there is >80% of BSA involvement.
Sean Whittaker Erythroderma 10