Hi, thanks for taking the time to respond to my post. I really should seek out an allergy specialist sometime.
Hello and hope you are doing well.
Soy allergy is most common in children, especially toddlers and infants. As you grow older, your digestive system matures and your body is less likely to absorb food or food components that trigger allergies. In some cases, people who are allergic to wheat, beans (legumes), milk or other foods can have an allergic reaction to soy. You can confirm this by blood test to see for raised IgE levels and skin testing for soy products.
I would suggest you obtain a referral to an allergist or an ENT who does allergy testing. Some allergies can be life-threatening as they can precipitate anaphylactic shock in which the swelling can be so severe that it impairs the ability to breathe. So, you may need an EpiPen.
Hope this helped and do keep us posted.