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Some people will suffer a mild form of an allergic reaction and have minor symptoms including such things as hives. Those with a more serious reaction to onions may even have problems just breathing in the smell of onions without having an allergic reaction that can compromise their health.
Some people have immediate reactions, while others dont exhibit symptoms for at least 24 hours. The degree of their allergic reaction depends on how sensitive they are to onions. As for the healing time, most people feel better as soon as the allergen is expelled from their body.