Fenómeno de Koebner

first described in 1871, the koebner phenomenon is one of the most well-known entities in dermatology. heinrich koebner is credited with the first adequate description of this peculiar disposition of psoriatic skin. he was one of the outstanding dermatologists of the 19th century and reported the formation of psoriasiform lesions in uninvolved skin after excoriations and horse bites. types of koebner response, a list of injuries capable to produce it and a review of the pathogenesis are reviewed.