It is not so probable that you are allergic to propolis as that you might be allergic to (one of) the three(s) wherefrom the bees have collected the substances.
Especially in the case you are aware of allergies to individual trees, it is best to do a small test on the skin by testing the reaction through applying of few drops and giving it time to react. It is impossible to determinate which trees are present in propolis as bees are wild and free and therefore they go and find the best "material" available in the area of their hive.