I rub the fuzz lightly on my lips before taking a big, juice-dripping bite. That bane of the fruit-loving, Oral Allergy Syndrome, has kicked in. is an allergic reaction to certain proteins in a variety of fruits, vegetables and nuts. . Indoor · Healthy Home · Pets · Dust Mites · Fragrance · Drug Allergy · Skin Allergy. Don't ditch the fresh fruits and vegetables because you've been diagnosed with Oral Allergy Syndrome. The itchy mouth is a miserable side effect of eating. Allergies to raw fruits and vegetables can cause severe symptoms that must be treated immediately. However, this type of allergy, also known as oral.