My husband had that too.....NHS doc's were not of much help...they gave steroids and antibiotics..... He could not go to work for a week as it swelled all over the body, ...at last I tired the Indian medicine, 1tsp Cumin Powder + 1tsp Dry Ginger powder + 1tsp Coriander powder.....all put to a lit of water, just boil and cool it down.....keep giving this syrup every half hour...and also...one should avoid hot food......that shall fix the problem in 2 days.