Synonym: isomorphic phenomenon
Features of Koebner phenomenon:
(1) presence of an underlying immunologic disorder that affects the skin
(2) occurrence of some form of trauma to skin uninvolved by the immunologic disorder
(3) development of a skin lesion associated with the underlying immunologic disorder at the site of the skin trauma
The new skin lesion tends to conform to the outline of the traumatized area.
Conditions in which the Koebner phenomenon may occur include:
(1) psoriasis
(2) discoid lupus erythematosus
(3) Henoch-Schoenlein purpura
(4) sarcoidosis
(5) Leishmaniasis
(6) lichen planus
(7) vitiligo
(8) Darier disease
Traumatic events may include:
(1) blunt or penetrating trauma
(2) surgical scar
(3) burn scar
(4) tattoo
(5) drug injection site
(6) excoriation
(7) Herpes zoster scar
