Koebner phenomenon L40.9; L43.9

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 21.06.2025

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Synonym(s)

Coebnerisation; Irritation effect isomorphic; Isomorphic irritant effect; isomorphic phenomenon; Köbnern; Koebner phenomenon; Koebner sign

History
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Köbner, 1876

Definition
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New occurrence of lesions belonging to the underlying disease (isomorphism) in a previously mechanically, thermally or chemically irritated skin (e.g. scratch marks, burns, etc.).

The palindrome of the Köbner phenomenon is the Renbök phenomenon.

Occurrence/Epidemiology
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Occurrence in the following diseases, among others:

Literature
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  1. Köbner H (1872) On the etiology of psoriasis. Zschr Dermatol 8: 559-561

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Last updated on: 21.06.2025