Allergen

11 clues
Dander, e.g.
Pollen, e.g.
Dust, for one
Dust or pollen
Pollen or dust
Bee venom is one
Egg whites, to some
Dust or pollen, e.g.
It may cause a reaction
Sneeze-causing substance
Reason for sneezin', perhaps
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Alle
Allears
Alledly
Allee
Alleen
Allees
Allegation
Allegations
Allege
Alleged
Allegedly