Erythroderma (exfoliative dermatitis) part one: underlying causes, clinical presentation and pathogenesis.

Erythroderma (exfoliative dermatitis), first described by Von Hebra in 1868, manifests as a cutaneous inflammatory state, with associated skin barrier and metabolic dysfunctions. The annual incidence of erythroderma is estimated to be 1 to 2 persons per 100,000 population in Europe with a higher male-to-female ratio. Erythroderma may present at birth, develop acutely or insidiously (due to progression of an underlying primary pathology, including malignancy). Whilst there is a broad range of diseases that associate with erythroderma, the vast majority of cases result from pre-existing and chronic dermatoses. In part one of this two part concise review, we explore the underlying causes, clinical presentation, pathogenesis and investigation of erythroderma, and suggest potential treatment targets for erythroderma with unknown causes.