Grapes & blueberries do that to Masyn & Spencer too...I still give them, but only 10 or so a day, and not everyday. Of course it helps that they aren't readily available at our little store, so I don't buy them often. Raisins do it too, Masyn once at a whole cup of raisins (DH didn't stop her!) and it was not pretty.
Glad to hear it was *just* the sunscreen and not a new food allergy, much easier to deal with that way!