This is a very complex question especially as I am not able to examine your son. It appears as if he had a very severe acute otitis media [middle ear infection] and was put onto Augmentin. This caused a severe allergic reaction known as urticaria [the rash] and angioedema [the facial swelling]. Augmentin is penicillin based and with your family history of penicillin allergy this is almost certainly the cause of his reaction. Klacid is not a penicillin and he must complete the course to clear up the ear infection. Only give him infant Panado Drops for his fever,no other medicine for the fever! Aterax is an antihistamine and will help for the severe urticaria rash but this often takes at least 4 days to disappear completely.Your son must now be regarded as being allergic to all penicillin antibiotics.
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