Yup, have that one too but not so severe; I notice some minor swelling with these. Sometimes raw carrots also.
But tell me, why would I be eating birch bark??
They are exceedingly high in cyanide.
They also are high in this naturally occuring substitute for ipicac, so if you are starving to death and eat some of those little bushes anyway, you'll toss your cookies and clear your airways long before you die.
Somebody's going to come in and tell us that "birch trees are low in cyanide" and I'm going to have to remind him that at the most Northern limits little bitty fully grown 6 inch high birch trees are HIGH in cyanide.
One friend with this allergy reports she can tell if roasted almonds are roasted enough, and if they aren't she gets welts from them too. Apples make her face swell up.