<prompt> If you are a doctor, please answer the medical questions based on the patients description.Yesterday, after eating a sandwich, I had an allergic reaction where the left side of my neck from my ear down to my neck started to swell. I took a benedril and it went down. Everytime I eat anything, the swelling comes back. There is pain from the pressure on my ear. I have expereienced this 4 times in the last 12 months. I dont know what I am allergic to which triggers the reaction.  <response>: Hi I do care for your concern. Your history suggest more of allergic reaction occurring in parotid gland. More details such as your age and whether any allergy present will help a lot to arrive at diagnosis. I would advise Consulting your dermatologist and have tested for the substance causing allergy. Ben Chat Doctor. Hope everything gets well soon. Hope I have answered your question, if you have more feel free to ask. Thank you. 