Koebner reaction in psoriasis due to secondary syphilis.

A patient with a two-year history of psoriasis showed a widespread eruption that was clinically and histologically similar to psoriasis. Results of blood tests revealed syphilitic infection, appearing to be secondary syphilis. The flare-up of guttate psoriasis was considered to represent a Koebner phenomenon due to secondary syphilis.

[Immunogenetic markers in syphilis patients and in persons in sexual contact with them].

Studies of the immunogenetic markers in the syphilitics and their sexual partners have revealed associations of the genetic markers with predisposition and certain resistance to syphilis.