Hey, Alanis! Say one of your ears got infected shortly after you got them pierced, and you've been faithfully taking care of it for months with Bactine and Neosporin. Then upon returning home for Winter Break, you went to the dermatologist to get allergy testing, only to find out that it was not Nickel as you suspected you were allergic to, but two substances that happen to be found in Neosporin and Bactine.
I'd say that's ironic.