Koebner phenomenon


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Koebner phenomenon

[kōb′nər]
Etymology: Heinrich Koebner, Polish dermatologist, 1838-1904; Gk, phainomenon, something observed
the development of isomorphic lesions at the site of an injury, occurring in psoriasis, lichen nitidus, lichen planus, and verruca plana.
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Koebner phenomenon

Koeb·ner phe·nom·e·non

(keb'nĕr fĕ-nom'ĕ-non)
Heightened susceptibility to the effects of trauma and chemical exposure in those with psoriasis, lichen planus, and other chronic dermatoses.

Koebner phenomenon

(kĕb′nēr)
[Heinrich Koebner, Ger. dermatologist, 1838–1904]
The appearance of a skin lesion as a result of nonspecific trauma (e.g., sunlight, burn, operative wound). It will appear at the trauma site and may be of a type found elsewhere on the skin. It may be seen in lichen planus or eczema but is particularly characteristic of psoriasis. The lesion must be sufficient to act on the papillary and epidermal layers of the skin and will appear in 3 to 18 days following the trauma.
References in periodicals archive ?
This is distinctly different from an isomorphic response, also known as the Koebner phenomenon, which describes the development of the same disease at a site of damaged or traumatized skin.
Trauma--a psoriatic lesion can occur at site of trauma referred to as Koebner phenomenon.
Differential diagnoses of posttraumatic eczema include trauma-induced psoriasis, Koebner phenomenon, foreign-body reaction, herpes simplex outbreak precipitated by trauma, and superimposed allergic contact dermatitis caused by topical medications.