Hi, lately my lips have been swelling up for no

Patient: Hi, lately my lips have been swelling up for no real reason I have been to the doctors and one doctor said it was a cold sore another doctor said it may be an allergy but there isn’t much they can do for me. I was advised by my doctor to take claratyne to control the swelling but that don’t really help I have gotten a blood test and nothing has come up on the blood test. My sister said it may be to do with MSG in the foods I eat but I have cut all the processed and bad foods that have the noticeable MSG in it out of my die straight away but that doesn’t work because it has happen again hope you can help . Thanks

Doctor: