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.
Schistosomiasis is best known in its visceral form but it can attack the skin,
its ectopic cutaneous manifestation being rare and clinically difficult to
diagnose. It is characterized by isolated or coalescent papules, erythematous,
pruritic or asymptomatic, with zosteriform distribution, often located on the
trunk. The authors report a case of a 28-year-old female patient with lesions on
the abdomen, with positive stool results for Schistosoma and absence of active
symptoms of visceral disease. The case reveals rare exuberant cutaneous
manifestation and the importance of the diagnosis of this entity in patients
from endemic regions.
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