My mother said that i have egg allergy.but yesterday i eat egg and my arms full of small bump. did the allergy can appear again?

Yes : I am not clear about your question..Are you saying the egg allergy was when you were younger? &you used to eat eggs as a ?Teenager without a problem? But yesterday you had a reaction? If so, then yes that is possible. I suggest you take a picture of the rash&see allergist. They can do an easy scratch test(no needle) to help answer the question. For now, it is best to avoid eggs until you see dr.

Other allergy: It is possible that the egg ingestion was coincidental and you have a rash due to something else. We eat 3 - 6 times a day and could develop rashes due to a variety of reasons. Get checked by an allergist before labeling yourself egg-allergic.