I m a 27 year old male with some trouble falling asleep at night. I took melatonin 3mg every night for a week and started to get hives. Could an allergic reaction to the melatonin be the cause of the hives? If so could the hives still be appearing with the same intensity(only to be gone a half hour later) after a month without taking the melatonin ?

Summarized question: Could Melatonin Cause Hives ?