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Introduction: Lugol is a solution composed of elemental iodine (5%) and potassium iodide (10%) together with distilled water, used during colposcopic assessment to identify possible cervical cell alterations., Case Report: A 31-year-old female who presents an episode suggestive of anaphylaxis ninety minutes after a colposcopy exploration, successfully treated with intramuscular hydrocortisone and desclorfeniramine. During colposcopy Lugol solution and acetic acid was applied. Skin prick test (SPT) with Lugol solution was positive (papule 9x7 mm). Four control tests were negative. Intradermal tests (IDT) were positive with Lugol and elemental iodine, the last one turned-out irritant. It was ruled out possible cross-reactivity with other iodine preparations (Betadine®) and potassium iodide (Yoduk®)., Conclusions: Our report demonstrates a rare case of allergy to Lugol solution with positive SPT and a clinical suggestive reaction, with tolerance to other iodine preparations and potassium iodide., Competing Interests: Los autores declaran no poseer conflictos de interés.