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Atopic dermatitis (AD) is a common inflammatory skin disease with multiple clinical manifestations. Among AD phenotypes, psoriasiform AD shows the coexistence of eczematous itching lesions in flexural areas with psoriasiform plaques. The use of anti-interleukin (IL)-4 and anti-IL-13 in psoriasiform AD may lead to therapeutic failure or worsening of manifestations.

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Paradoxical tralokinumab-induced psoriasis in a patient with atopic dermatitis.

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Article Synopsis
  • Psoriasis and atopic dermatitis (AD) can coexist in patients, contrary to the belief that they are opposing diseases, especially with modern targeted therapies.
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Hydroxyurea is used in essential thrombocythaemia to lower thromboembolic risk. Cutaneous adverse effects from hydroxyurea are diverse. Small vessel vasculitis has been rarely reported, and the coexistence of several different morphologies has not been described.

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Histopathological patterns indicative of distinct adverse drug reactions.

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Histologically, drug eruptions may present virtually all patterns of inflammation in the skin, including spongiotic, lichenoid and psoriasiform dermatitis as well as vasculitis or panniculitis. Drug reactions may mimic specific skin diseases such as lupus erythematosus, lichen planus or lymphoma. While a single drug may cause a wide range of reaction patterns, no reaction pattern is specific for a certain drug.

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