Koebner reaction

Ostraceous Psoriasis Presenting as Koebner Phenomenon in a Tattoo
Koebner phenomenon
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Authors Jacob Reinhart MD, Matthew Willett MD, and Neil Gibbs MD present a case of psoriatic lesions precipitated by an upper arm tattoo. Psoriasis is a common dermatologic skin condition with a variety of morphologic presentations. These variations include the less common hyperkeratotic form, psoriasis ostracea, defined as having pronounced adherent scales (skin lesions) resembling an oyster s …