Hi, Tammi--
I know that at 6 months old, if he has food allergies, his diet is already pretty limited; but if your son somehow doesn't outgrow this, and if you live in the Orlando area, I would highly recommend seeing my pediatrician, Dr. Cornelia Franz (see my review of the Franz Center on this website). She's an excellent problem-solver and makes maximum use of both the traditional and the alternative medical fields. My friend's 2-year old has always had horrible allergic reactions on his skin. One time when he was a baby, the mom just wiped something off his face with a paper towel, and he looked like a burn victim all over his body for weeks afterward.
Dr. Franz had the boy go through a special blood test which broke his blood down to all the various components--including all the stray elements and unwanted metals. Many of these probably came from the mother herself during pregnancy. Although this process is perfectly safe, solid and scientific, it's still considered "alternative medicine" for some weird reason, so most traditional doctors don't know about it. However, working with the results of this test, Dr. Franz has been able to recommend simple dietary changes to clear these stray metals from the boy's system. At this point, he still has some allergies, but to the relief of both mother and child, the reactions are much less severe. According to my friend, Dr. Franz has even had some amazing successes with autism by using this same technique!
Again, just something to keep in mind in case the condition persists!