I confess, I've been a bit blase about A's food and potential allergens - although DH has asthma, eczema and hayfever, and we were slightly cautious with M, poor A has been suffering the curse of the second child (and the fact that M has had no food problems at all) and I haven't really been concentrating very hard on what she's been eating.
Anyway, the other day the girls had scrambled eggs on toast. A ate some of the egg, but tbh wasn't very impressed with the taste so didn't eat loads, but where it had touched her face it had gone very red and blotchy; it seemed to be irritating her so of course she rubbed it more and it got worse. We washed her hands and face pretty quick, and within about 10 minutes it had gone completely. There were no bumps, no swelling of anything, she was breathing ok, just red and blotchy and irritated. All the other ingredients (milk, butter, bread) she has most days with no problems, so I'm assuming that it's the egg.
Does this sound like a full-on allergic reaction, and if so, could it be worse next time she's exposed to it? I think she's had egg before, but in things, rather than as the main ingredient, but my memory is a bit sketchy

Her cousin (DH's brother's daughter) is allergic to eggs and dairy.
Thank you all!