itchy lips

My 7 year old son is having almost daily lip itching with minor rash around lip/chin, some slight lip swelling, from unknown cause.  Currently undergoing allergy testing, which suggested wheat, meat tenderizer and garlic.  I cut these out but he is still getting symptoms.  He also has peanut allergy.  Can someone out there help me?!  Am not getting answers from allergist.

[limnnee]

Is your son's condition only prevalent during  dry season?  I have almost similar condition too once in a while. My lips woulds suddenly feel itchy  and the area around the lipline  would  peel. My lips would also feels crusty and I could see peels of dried skin on  certain part of  my lips. Once it got so bad that my lips were actually swollen and red. I went to 2 dermatologist who prescribed antibiotic cream to me but it didn't work. In the end, I went to see a pharmacist who told me that it could be caused by dry weather.
I took note of it. Soon I noticced that every time the weather is dry or if I was in the air-con room for a period of time, the condition occur. The solution is, I have to keep on applying lip balm or petroleum jelly.
Perhaps you can try this out. It would take you weeks to see the improvement.