"Food allergy symptoms are caused by the interaction between a food allergen and an antibody known as IgE (immunoglobulin E). To diagnose a food allergy, your allergist may use a skin prick test (SPT) to measure the presence of IgE antibodies for the suspect food. SPTs are inexpensive, produce immediate results, and can be performed in the doctor’s office."
Source: foodallergy.org
You are right. All it took was 10 seconds for me to google. I am an idiot. What is true however is that it is much more dangerous when ingested orally. All my nicotine shots (for ecigs) carry the typical "skull" warning symbol, with the advice to call a doctor if you accidentally swallow some.