To which doctor to go with symptoms of urticaria?

good evening, I have itchy skin and after scratching it pops up urticaria, the more scratch I scratch the more itchy / hurts. Feeling like after a strong burn with nettle. During the day it stops in the evening appears. The allergist said that I do not have a food allergy, and these are matters of the digestive system. But the gastrologist referred me to an allergist. Which lacaper should I go to? When using Clatra, itching and blisters subside after about half an hour. I am 57 years old.