[Extracorporeal photopheresis].

Photopheresis, originally developed in dermatology, has become a treatment method accepted across various disciplines. A basic knowledge of photomedicine and photobiology is one of the cornerstones of dermatology. Even if photopheresis is used for indications that are not specifically dermatological, e.g. graft-versus-host disease or Crohn's disease, an experienced dermatologist trained in the use of photopheresis should therefore always be consulted.