It does appear that your baby niece is allergic to egg. She developed a typical allergic rash called urticaria or hives when she was given the white of an egg recently. The white of the egg is more highly allergenic than the yolk, but she must NOT be given any egg at this stage. She has a good chance of growing out of her egg allergy. At this stage it would be best if your little niece was seen by a paediatrician and tested for egg allergy. This will give an indication if her allergy is dangerously high and if she needs to have emergency treatment available in case she is accidently given any egg now.
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