Allergy test question?

i took an allergy test to see what i was allergic to in order to try and clear up small patches of eczema. the allergy test had a machine tht different substances were put into to see what i am allergic to. anyway, i noticed a small flare up after the test, do u think that the test was the cause of the flare up? or was it just coincidence (i didnt ingest any food)