sour cream

I don't have the typical food allergies. I can eat nuts, milk, wheat, etc, but I found that I am allergic to the sour cream flavoring here in England. I could eat sour cream flavored Pringles in the US, but for some reason the flavoring here has different ingredients. My lips became puffy with a red ring around the inside of my mouth, the corners of my mouth were red, and food tasted weird for about a week. From the Pringles website here are the ingredients:

UK Ingredients
DEHYDRATED POTATOES
VEGETABLE OIL
RICE FLOUR
WHEAT STARCH (GLUTEN FREE)
SOUR CREAM & ONION FLAVOUR (LAVOUR ENHANCERS: MONOSODIUM GLUTAMATE, DISODIUM GUANYLATE AND DISODIUM INOSINATE, ONION POWDER, DEXTROSE, SUGAR, SWEET WHEY POWDER, LACTOSE FROM MILK, CITRIC ACID, LACTIC ACID, MALIC ACID, SOUR CREAM POWDER, FLAVOURINGS, MILK PROTEIN)
MALTODEXTRIN
EMULSIFIER: E471
SALT

US Ingredients
DRIED POTATOES
VEGETABLE OIL (CONTAINS ONE OR MORE OF THE FOLLOWING: CORN OIL, COTTONSEED OIL, SOYBEAN OIL, AND/OR SUNFLOWER OIL)
RICE FLOUR
WHEAT STARCH AND MALTODEXTRIN
CONTAINS 2% OR LESS OF: MUSTARD (DISTILLED VINEGAR, MUSTARD SEED, SALT, TURMERIC), SALT, MODIFIED CORN STARCH, SODIUM DIACETATE, MONOSODIUM GLUTAMATE, ONION POWDER, GARLIC POWDER, SOYBEAN OIL, HONEY
NATURAL FLAVOR, CITRIC ACID, DISODIUM GUANYLATE, DISODIUM INOSINATE, and ROSEMARY EXTRACT
CONTAINS WHEAT INGREDIENTS