Allergies - when to worry?


My daughter just had an allergic reaction this evening after dinner. The only new thing she had was a different type of orange we just received from our new monthly citrus subscription. She’s had oranges before without a reaction but she’s never had this type of orange before. She started to get hives between her eyebrows and under her eyes but otherwise seemed fine. Didn’t have difficulty breathing or swallowing. I nursed her and she went to bed. Should I be giving her Benadryl? She is 21 months old. What signs should we be on the lookout for? Thank you.