My best guess is that it is a detox reaction and that your body is still toxic and you may seriously consider working up to resuming normal eating again, doing your Liver Flush and then going back on The Master Cleanse for round two of your Cleansing work. If it were an allergy I am going to say you would have broken out around your mouth, face, that sort of thing. During my Master Cleanse (I did an extended one), I would break out in weird boil looking skin eruptions, and have itching going on. It did pass as I kept drinking the lemonade and lots of water. The skin is the largest organ of elimination.