Hi My daughter is three years old, she has had a viral infection for nearly three weeks, we are aware that our daughter is allergic to citrus fruit and after the first instants of here having the viral infection we managed to clear after a week, and this has now gone on for a time, had her to the doctors, but have noticed when she seems to be well, she will then stop at Grandma and Grandads, after telling them that she is allergic to Citrus it feels they do not talk any notice and seems to come back with a viral infection, but this time we have noticed that she had got blisters on her tongue could these be from her allergy