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A member asked:
I am allergic to yeast and by ate something with yeast today. have mouth ulcers and also top lip has dark patch. when and how will dark patch go?
A doctor has provided 1 answer
Varies : Allergic type reactions can pass quickly or last for a month or more. They can affect just an immediate area and result in blood being trapped in the skin layers which will fade over time or can move over the whole surface of the body changing with time and exhibit a burning sensation that may be relieved temporarily with calamine lotion. So it is difficult to say how long this may last.
Answered 9/29/2016
4.4k views
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