The following two factors are necessary for the manifestation of Köbner's phenomenon in psoriasis: (1) psoriasis induction by exogenous or endogenous provocation and (2) the simultaneous presence of active psoriasis. In practice, this phenomenon can be more widely defined because the stimulus is not always noticed by the patient and may include the first manifestation of psoriasis in a latent case.1
Report of a Case
A 10-year-old boy was seen in October 1979 for two kinds of nonpruritic eruption. One had been present since birth and the other had been present for one month. No other family members were similarly affected, but the patient's 9-year-old brother had dystrophic, pitted nails. Physical examination showed a systematized, congenital, epidermal nevus on the left side of the body, involving the upper and lower extremities, the chest, and the abdomen. Multiple, erythematosquamous patches were present but only on the preexisting lesions of the
Thivolet J, Goujon C. Linear Psoriasis and Systematized Epidermolytic Nevus. Arch Dermatol. 1982;118(4):285–286. doi:10.1001/archderm.1982.01650160075031
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