one in 50 children in the UK have egg allergy.
Its also one of the few that can be outgrown , like milk. and is often outgrown before 5 yrs old.
However like all classic food allergy, it can be serious. and medical advice is required.
This is not always a GP.
Its also worth noting that egg and peanut allergy do seem to go hand in hand. again this is a good reason for seeking medical help.
All egg has to be avoided, although it is the protein in the white that causes problems, a trace can cause a reaction. And if you have ever tried to seperate a yolk from white when cooking, you can see how difficult it would be to remove all traces of egg white.
when egg is outgrown, cooked egg seems to be tolerated first. This is egg in sponge cake, exposed to high temp, as this changes the protein stucture.
Egg white in icing can cause problems.
Raw or partially cooked, such as boiled , quiche , or omlettes take longer to out grow.
The majority outgrow by 7 , but some children, like my son have bodies that take there own sweet time doing this , he is now 10. He passed a cooked egg challenge at 7.
I hope this is helpful.