Tongue erosions and diet cola
Jacobs and Steele report on the case of a 38-year-old woman who presented with a 10-year history of painful ulcerations on her tongue. She reported that she drank large quantities of diet cola and some orange juice daily and that she used cinnamon flavoured toothpaste and mouthwash nightly.
Patch testing showed positive reactions to balsam of Peru (a fragrance as well as a flavouring agent put in cola drinks that cross-reacts with orange juice) and cinnamic aldehyde. The woman was diagnosed with allergic contact dermatitis, placed on a restricted diet and a fragrance-free regimen. Her condition resolved.
Jacob SE, Steele T.
Tongue erosions and diet cola.
Ear Nose Throat J. 2007 Apr;86(4):232-3.