Hi.. Can understand your concern.. As per your complain it seems that if you do not have tooth problem then sudden occurrence of swelling in taking carrot can be either due to ALLERGIC REACTION to carrot or due to some chemicals which could be present over the surface of the carrot due to improper washing or cleaning before eating it. In this case there caused an allergic reaction leading to swelling and inflammation which is appearing as a bruised appearance. Along with advil which is an anti-inflammatory painkiller containing Ibuprofen you need to take some antihistamine containing medicine like Allegra to get relief. Along with it you can apply ice packs over the bruised swelling to reduce the inflammation and swelling. Maintain good hydration by drinking plenty of water. Take soft diet to avoid further discomfort. Don t get anxious and keep calm.You will gradually get improved and if there are any more symptoms appearing like rashes, itching,hives,breathlessness or the swelling increases you should consult a doctor. Hope your query is solved.. If you find the answer helpful please write a positive review and click on find this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.