Peanut allergy in child

Patient: My son is 3 and he has been having some tummy problems. His GI ordered some blood work for food allergies. It came back as a class 3 peanut allergy. A week before he had a skin test for allergies and all food allergies were negative. In the past he had a cat allergy test and the skin was negative, but blood positive.Once I got the results of the peanut allergy I called his allergist and she said that it was nothing to worry about. Isn’t any class of peanut allergy something to worry about?