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Per Healthline, margarita burns “result when a chemical called furocoumarin reacts with sunlight. This chemical is found in limes and citrus fruits, along with celery, figs, fennel, and a number of other plants.”

The sap contains a blistering agent named furocoumarin; don’t touch any part of this plant.

The sun’s ultraviolet rays excite electrons in furocoumarin molecules, causing them to bind to two of the DNA bases—thymine and cytosine.