The Koebner phenomenon, described by Koebner in 1876, represents the appearance of isomorphic skin lesions on the unaffected skin of patients suffering from certain skin diseases. The mechanism of the Koebner phenomenon is not yet clear, but cytokines such as basic fibroblast growth factor may be involved. Several types of injury can trigger the Koebner phenomenon, such as irritation, physical injury, surgical wound, and sunburn or radiation therapy. We report a case of recurrent Koebner phenomenon in psoriasis in a 27-year-old man, which developed after several skin grafts.
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