Horse Chestnut tree pollen. I've never heard of anyone else allergic to it, but come flowering season, a walk down one of the streets in Halifax which are lined with these beautiful trees leaves me sneezing, red-eyed, with sinuses in full revolt, simultaneously swelling shut and dripping mucus. It ain't pretty. Fortunately, they only bloom for a couple of weeks!

But no, no deodorant allergies.