We test milk with our daughter ever couple months or so to see if her reaction to it is gone. Today we hoped that maybe since she is almost 2 that it will have subsided.
We gave her some graham crackers with milk-based icing (1/2 cup powdered sugar to 1 Tbsp milk). Of course, she didn't want to eat them at first, so I had to jazz them up with some sprinkles. We were so optimistic when after the normal five minutes it takes for her to react, there was no reaction. It took about 10 minutes for her lips to get puffy and those little hives to appear. I say that's progress. We gave her 1 tsp of Benadryl and within about 10 minutes the puffiness was about gone. So no milk yet, but maybe soon!
Please follow the advice of your doctor before you do any allergy testing at home. Our daughter's reaction is just hives around the mouth and we know what to expect. Some allergic reactions can cause a child to stop breathing. You don't want to be that situation if you can avoid it.