Clinically characteristic lesions of psoriasis are sometimes found on old surgical scars. Interaction between psoriasis and old scars modifies both processes. A normally structured dermis is not requisite for the occurrence of psoriasis.
Paslin DA. Psoriasis on Scars. Arch Dermatol. 1973;108(5):665–666. doi:10.1001/archderm.1973.01620260015004
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