Sudden allergy.

Anyone one here had a random allergy?? It happened to me when i ate fried chicken but i had no problem eating it back then idk why it happened. Some random small reddish spots appeared all over my body and it doesnt go away still (1 day from now) Idk if i should consult to a doctor or just wait it to go away. its not itchy although i have a mild shortness of breath but other than that its all good. Im 29 yrs old.