Allergy to onion is very rare. It is also rarely a cause of allergic contact dermatitis and urticaria.
There is no information on syndromes associated with onion allergy.
Onion is in the Alliaceae plant family, other plants in this family are chives, leeks and garlic. If your allergy is severe these plants may also cause allergic reactions.
Healthline - Am I Allergic to Onions?
Anaphylaxis Campaign - Onion and Garlic Allergy
Allergic hypersensitivity to garlic and onion in children and adults, 2020
Involvement of Lipid Transfer Protein in onion allergy, 2007
Bronchial asthma, rhinoconjunctivitis, and contact dermatitis caused by onion, 1994
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