Yes, you can see photos of hives by clicking the blue underlined text.   There are also photos of contact dermatitis, which isn't exactly an allergic reaction, but it may look familiar.   As for a possible reaction to the eggs, you should ask your doctor right away. I don't know if those allergens pass through breast milk. There have been no studies showing that mothers getting allergy shots (where they are injected with small amounts of substances that cause their allergy symptoms) have passed on those allergens to their breastfeeding babies, according to AAAAI, but you'll must double-check with your doctor to get a clear recommednation.