My son who is 26yrs old is currently suffering from a very sore throat, swollen gums, gland in his neck and ulcers on the side of his tongue plus he has a fever blister on his lip. He has never had fever blisters or ulcers in his life. He has been complaining for a while now that he coughs every morning and his nose and eyes sometimes water. He is a non smoker and is fit...he does gym at least 2 to 3 times a week. The doctor seems to think this is all caused by allergies....can this be right? They have given him an antibiotic, tablets for pain and also tablets for allergies !!