Hi.. Thanks for the query.. As per the symptoms it looks like allergic reaction.. As soon as you come in contact with the allergen the swelling spreads but the reaction appears milder and starts getting reduced soon.. The causes can be any foods or medications, any skin cosmetics, environmental irritants etc.. So my suggestion is to consult an Emergency room and get evaluated when the swelling occurs and get an allergic test done.. You can also try taking anti allergics like benadryl to reduce swelling.. Continue doing cool compresses.. Once the allergen is ruled out try avoiding exposure to it.. Hope this helps.. Regards..