A 14-year-old girl presents to her pediatrician with complaint of itching sensation in her mouth and swelling of the lips after eating an apple that morning. The patient was last seen 6 months ago for a preventive medicine examination. Her past medical history includes episodes of seasonal allergic rhinitis managed with over-the-counter loratadine. She did not take loratadine today and takes no other medication. Allergies are most troublesome in spring. She has no history of allergy to apples or other food, drug, or latex. History of present illness: The patient experienced an itching/tingling sensation in her mouth after eating an apple at a friend’s house. Soon after, the friend’s mother noted that the patient’s lip appeared swollen and red and called the patient’s mother to report concerns. Symptoms resolved spontaneously before mother picked up the teen. Mother is concerned whether the teen has developed an allergy to apples or may...

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