title: Case for diagnosis.
abstract: 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.
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Ludmila de Sousa Ursino
authors.initials: Lde S
authors.lastname: Mesquita
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Jonnia
authors.initials: J
authors.lastname: Sherlock
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Fedro Menezes
authors.initials: FM
authors.lastname: Portugal
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Lívia de Souza
authors.initials: Lde S
authors.lastname: Mota
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Fakhouri
authors.affiliation: Universidade Federal de Sergipe, Aracaju, SE, Brazil.
authors.forename: Samuel Freire da
authors.initials: SF
authors.lastname: Silva
mesh_terms: D000328:Adult; D001706:Biopsy; D005260:Female; D006801:Humans; D007642:Keratosis / Q000188:drug therapy / Q000473:pathology*; D011565:Psoriasis / Q000188:drug therapy / Q000473:pathology*; D012867:Skin / Q000473:pathology; D016896:Treatment Outcome