Its a stimulant: You can have an allergy to caffeine which presents with hives or rash after ingesting. My guess is that if you only get a rash on a hot day it is not due to the caffeine.
Answered 7/5/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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