Here is a few stuff that pisses me off.
Dust and Mildew.
I am not allergic to milk, gluten, eggs, squids, prawns, peanuts and any food that I can think off but I get allergy to Dust and Mildew.
Dust makes my eyes red and my scalp itchy.
Mildew, being what it is, makes my skin itchy when in contact.
Both are quite unavoidable for me.