http://www.m.webmd.com/allergies/guide/salicylate-allergy
Sounds like you may have some form of salicylate allergy.
Hello,
It is possible that you are allergic to mint or any of the constituents in which mint is a co-constituent like in tooth pastes along with mint,number of other ingredients are present.
You can find out whether you are allergic to mint or any other ingredient by getting allergy testing done. Skin tests are used for this purpose. This test involves pricking, scratching or injecting food extracts into the patient’s skin. The skin will react with redness and swelling for those extracts capable of eliciting an allergic reaction when consumed.Other tests used are blood tests like RAST and food challenge tests.
Treatment is complete avoidance of the offending agent.
Hope it helps.Take care and pls do keep me posted on how you are doing.