Allergies are no joke.

As anyone who has allergies knows, an allergic reaction happens when your body is super sensitive to something which might be harmless to most people - like a certain food, chemical, plant, animal hair, etc. - and that reaction can be anything from annoying stuff like sneezing, skin rashes, or diarrhea to the most serious and life-threatening reaction, anaphylaxis.

simpsonsworld.com / Via FOX

And sometimes allergic reactions can cause ~pretty noticeable~ symptoms on the face and body.

Often, severe allergic reactions can cause very noticeable skin rashes, hives, eczema, swelling, and more. So it's impossible not to notice when the person is having an allergic reaction.

E! / Via giphy.com