Ostraceous psoriasis is a rare form of psoriasis, characterized by lesions with
firmly adhered thick scales, in various colors, with surfaces resembling oysters
shells. The protracted course of clinical presentation allied with peculiar lesions
and histopathological examination permit the diagnosis. Lesions are usually resistant
to topical medications, requiring systemic treatment. It is important that
dermatologists are able to diagnose the unusual forms of psoriasis to avoid
iatrogeny. We report the case of a patient with ostraceous psoriasis treated with
methotrexate.
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