A man in his 40s presented with a 3-week history of multiple erythem-atous annular plaques on both legs. The patient reported that these lesions had appeared as erythematous and pruritic papules that had grown in numberand size, presenting a centrifugal spread. No associated systemicsymptoms were present. Treatment with topical antifun-gals and corticosteroids had failed to improve the lesions. Six weeks before, the patient had undergone a renal colic that was treated with non-steroidal anti-inflammatory drugs and opioid derivatives. No insect bites or othertriggeringfactors were recorded. His medical history included penicillin allergy, dyslipidemia, kidney stones, and allergic rhinitis.
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