Hebra (1860) entered into a friendly rivalry with the English dermatologist Robert Willan in his classical dissertations on the 'polymorphous ery-themata.' Even in these early years dermato-logical nomenclature had reached a complex state. Hebra comments that ' these various names by no means answer to as many distinct disese, and our object must be to determine which of them apply merely to ap...

Erythema multiforme (EM) is a type of cytotoxic dermatitis, which can be triggered by many factors; mainly herpes simplex infection and drugs being the implicating factors. Although it is self-limiting, recurrences are common. In this article, definition, epidemiology, aetiology, pathology, pathophysiology, symptoms, diagnosis, differential diagnosis, therapy, prognosis and progression of EM wi...