You can also put Borage oil on topically. There are pubmed studies even that showed this worked. You want to get one with the highest percentage of GLAs.
And probiotics for sure.
And, it seems some people test better for food allergies with the blood test, not the skin test. I would do the blood testing personally. As well as perhaps muscle testing.
My ds1's allergies were solved by going to the simplest diet we could think of: turkey, rice, pears, maybe sweet potato. Turns out, it was the poultry. Even turkey. so all eggs, chicken, turkey, etc were out.
Eventually with enough help his gut healed and he can now eat at least eggs. And occassionally he will eat chicken soup.