Not contact dermatitis, Lisa; sounds like urticaria. Treat with benadryl ORALLY--not the cream, doesn't work well and many people do develop a contact dermatitis to this eventually.
In most acute (less than 6 weeks of daily or near daily hives) urticaria, the cause is often post-viral. It goes away. If it persists beyond six weeks, get seen.
Of course, if you develop lip, tongue, eyelid swelling and/or you can't breathe, get thee to an ER.
-Tina
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