Actually the itch your symptoms could very well be die off as a lot of people have reported at least the itchy bottom. Don't know about the blisters on the lips.
Could be a reaction to the cereal bars yuo have been eating too. I would be more inclined to think die off, as you said there were pumpkin seeds in them and, thea fact that you are eating garlic. Worms and parasites don't like it. It kills them.
And though those things work, you should start a parasite program that will have all the ingredients to wipe out all stages of growth including the eggs laid by the critters.
Sounds like you are off to a good start with what you are taking.
Check out the cleansing forums on how to cleanse the bowel and make it an unfriendly host to these health stealing creatures. :)