I just noticed a post where you mention that your DS is allergic to sesame.
How many reactions has he had? What was it/were they like?
DS is also allergic to sesame and has had 2 reactions. The first was very sudden; he broke out in hives on his mouth, neck and hands (we weren't sure of the cause that time). The second was worse; he made a few funny noises and broke out in hives all over his body. The Benadryl didn't make any kind of difference that time and we ended up in the hospital. We now have an EpiPen and are awaiting testing.