Dermatitis due to cinnamon oil is either a rare event or one rarely reported. Only six references to dermatitis from cinnamon or cinnamon oil have been found. White1 attributed a dermatitis of the hands, face and abdomen of a young woman to cinnamon (cassia) oil used to flavor toothpicks. Tulipan2 obtained positive reactions to patch tests with cinnamon and cinnamon sugar in a baker with dermatitis of the hands. Silvers3 reported a case of stomatitis and dermatitis due to sensitivity to clove oil and cinnamon oil. Miller4 observed cheilitis in a woman exposed to the vapor of cinnamon oil; a patch test with a 2 per cent alcoholic solution of cinnamon oil gave strongly positive reactions, and a fume test with a 1 per cent alcoholic solution of the oil also gave a strong reaction on the forearm in seven hours. Howell,5 in a tabulation
LEIFER W. CONTACT DERMATITIS DUE TO CINNAMON: Recurrence of Dermatitis Following Oral Administration of Cinnamon Oil. AMA Arch Derm Syphilol. 1951;64(1):52–55. doi:10.1001/archderm.1951.01570070055009
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