Contact allergy to lidocaine

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Abstract
Two cases of contact allergy to lidocaine are reported. They also reacted to chemically related anesthetics of the amide type: one to bupivacaine, mepivacaine and prilocaine and the other to mepivacaine only. The patients also reacted to the chemically nonrelated cincaine, an anesthetic of the ester type. The lidocaine metabolites o‐toluidine and m‐xylidine gave negative reactions.