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Patch testing at the site of a fixed drug eruption

Patch testing at the site of a fixed drug eruption
Positive patch test reaction for the causative drug 10% in petrolatum. Note the positive reaction confined to the previously involved pigmented area.
Reproduced with permission from: Shiohara T. Fixed drug eruption: pathogenesis and diagnostic tests. Curr Opin Allergy Clin Immunol 2009; 9:316. Copyright © 2012 Lippincott Williams & Wilkins.
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