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Hello. My name is***** and I just rewad through your question.
What you are describing is very typical for hives. Yes, the doctor at the hospital should have been more thorough. But, hive can come and go for 1-2 weeks even after treatment has begun. They can even spread or migrate from one part of the body to another. I recommend continuing treatment for at least seven days, and by all means, go on your trip. This is not a reason to cancel.