yes that is possible so it may be wise to have an epipen available for emergencies. his reaction now is not considered a severe reaction. just a local response but who knows what the next one will do. take it from someone who has had two anaphylactic reactions to yellow jacket stings. it is better to be prepared.
if a person has a bad reaction to a bee sting can any stings in the future cause anaphylaxis? . my husband has a hive. he got stung on the back of his neck and the reaction escalated for 2 days to half the neck being bright red swollen and hard. is he in danger of anaphylaxis from future stings?