When I took it I had flushing during my course too. It went away mostly after I was done but I have naturally very sensitive skin to begin with. Talk to your derm and get his opinion if your really concerned though.
His opinion is that it will go away after the treatment, but like I said, I don't fully trust him. By the way, I also have an extremely sensitive skin. But flushing is something that you can feel it coming from inside, so I'm not sure about the relationship