Although it’s uncommon, reactions can be caused by artificial cinnamon flavor found in gum, toothpaste, and mouthwashes. A rare reaction to artificial cinnamon’s called contact stomatitis, which can cause a burning or itching in the mouth.Cinnamon can sometimes cause a non life-threatening rash known as contact dermatitis. … Antihistamines may help with any itching, which is important to treat because itching may make the rash worse. Stomatitis. Stomatitis is inflammation of the mouth or lips.
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