Joseph (Josef) Jadassohn (September 10, 1863, Liegnitz - March 24, 1936, Zurich) was a German dermatologist. He was an assistant to Albert Neisser at the Allerheiligen-Hospital in Breslau until 1892, the director of the university skin clinic in Bern (1896-1917), and later a professor of dermatology at Breslau University (1917-1932).

He was a pioneer in the field of allergology. He was among the first to take an immunological approach in research of dermatological disorders, and contributed to the understanding of the immunopathology of tuberculosis and trichophytosis. Two of the dermatological disorders named after him are: "Jadassohn's disease I" (a skin disorder originating at the elbow} and "Jadassohn's disease II" (a natal skin disorder affecting the face and scalp). He is credited for introducing patch testing for diagnosis of contact dermatitis,^[1] and in 1901 described a rare childhood dermatological disorder known as granulosis rubra nasi.

Together with his assistants Walter Dössekker (1868-1962), Max Tièche (1878-1938) and Felix Lewandowsky (1879-1921), he shares a handful of eponymous medical conditions, including:

• Jadassohn-Dössekker disease: Also known as atypical tuberous myxedema.
• Tièche-Jadassohn naevus: A hard, dark blue, benign melanocytic tumor.
• Jadassohn-Lewandowsky syndrome: An ectodermal dysplasia characterized by onychogryposis, hyperkeratosis, leukoplakia, hyperhidrosis and pachyonychia congenita.

[edit] Literary works

Jadassohn published a revision of Edmund Lesser’s Lehrbuch der Haut- und Geschlechtskrankheiten (14th edition, 1927-30), and from 1927 published the multi-volume Handbuch für Haut- und Geschlechtskrankheiten. Other noted written works of his include:

• Die venerischen Krankheiten, (1901)
• Ueber eine eigenartige Erkrankung der Nasenhaut bei Kindern (Granulosis rubra nasi). Archiv für Dermatologie und Syphilis, Wien, 1901, 58: 145-158
• Die Tuberkulose der Haut. In: Franz Mracek's Handbuch der Hautkrankheiten (1904)
• Allgemeine Ätiologie, Pathologie, Diagnose und Therapie der Gonorrhoe, (1910)
• Dermatologie, (1938)

[edit] See also

• Naegeli-Franceschetti-Jadassohn syndrome
• Jadassohn-Lewandown-Sky syndrome

[edit] External links

• Josef Jadassohn @ Who Named It