Can somebody be allergic to mashed potatoes?

Yes, it is possible to be allergic to potatoes, including mashed potatoes. Potato allergy is a type of food allergy, in which the immune system overreacts to specific proteins found in potatoes. Symptoms of a potato allergy can include hives, itching, swelling, difficulty breathing, and in severe cases, anaphylaxis. If you have any of these symptoms after consuming potatoes, it is important to see a doctor to get tested for a potential potato allergy.