They used to not bother me but now my whole hand or elbow etc will swell up. I used to never have issues with pollen but I have a mild pollen allergy and have to blow my nose several times every day, when I'm not too stuffed up to do so.
The human immune system is a strange construct.
When I was a kid if I so much as looked at poison ivy I would get infested with the stuff. Now I can get into it bare-handed and will barely get a blister.
Bee/wasp stings are exactly the opposite. Those didn’t bother me much at all when I was young. Now I swell up like a balloon when I get stung.
I keep an epi pen handy at all times these days.