Is it possible to be allergic powdered sugar?

It is possible to be allergic to powdered sugar, although it is not a common allergy. Powdered sugar is essentially granulated sugar ground to a fine powder, and it typically contains cornstarch to prevent caking. Some people may be allergic to the cornstarch in powdered sugar, or to the sugar itself. Symptoms of a powdered sugar allergy can include:

Sneezing

Runny nose

Itchy eyes

Hives

Difficulty breathing

Anaphylaxis (in severe cases)

If you think you may be allergic to powdered sugar, it is important to see an allergist for diagnosis and treatment.