Allergy tests: The tests you had done were food allergens. Although it is encouraging that they are negative, there are other things you could be allergic to, such as aeroallergens: pollens, grasses, trees, weeds and even animals. Any kind of a reaction to allergen could cause tongue swelling. There are other causes of tongue swelling, but allergies & trauma are most common. Not common to kill, though.
Answered 4/29/2018
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