The Koebner phenomenon (KP) is defined as de novo development of isomorphic cutaneous lesions by external trauma, such as scratch, pressure, and stretch, in the uninvolved skin of patients with cutaneous diseases such as psoriasis. However, the mechanisms behind KP are not yet fully understood.
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Published online: June 04, 2021
Accepted: June 2, 2021
Received in revised form: May 19, 2021
Received: January 10, 2021
© 2021 Published by Elsevier B.V. on behalf of Japanese Society for Investigative Dermatology.