Face Red After Eating Red Blotchy Rash On Chest Shoulders Neck And Sometimes Face After Eating?

Red blotchy rash on chest shoulders neck and sometimes face after eating? - face red after eating

Hello, I noticed the last 3 times I've eaten that came in a burst of red spots on the areas mentioned above, is flat and feels warm, but do not bite and disappears after 10 to 20 minutes, I think it is , the onion, it is connected perhaps never happened before? someone had done this to them? Thanks