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A member asked:
Can blue dye, such as fd&c blue no. 2, cause an allergic reaction such as swelling?
A doctor has provided 1 answer
Possibly: I suspect the answer is yes. 11 patients with chronic, unexplained itchy skin rashes that responded to medication changes centered around avoidance of coloring agents, fd&c blue no. 1 (bright blue) and blue no. 2 (indigo carmine). Reactions to agents that color medications and foods may be more common than previously appreciated. This is from journal of drugs dermatol. 2013;12(1):99-102.
Answered 11/28/2017
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