I got a couple bee stings yesterday and got a little more local swelling than I would normally get during the "season". I live in Minnesota, so you should infer that I haven't been working my hives in some months.
My reaction makes me wonder if any of my fellow apiarists have noticed any seasonal difference in their reactions to stings, perhaps more histamine after the first spring nailing.
I am not concerned about allergies, generally believing the rubric that local swelling is a normal reaction and only those with systemic reactions need be concerned. I am suffering more from idle curiosity. (This being winter in Minnesota, the emphasis is, of course on "idle.")