Hi...
Welcome to HEALTHCARE MAGIC...
I have gone through your query and can understand your concerns..
As per your complain you son seems to be suffering from Viral Infection causing the above described symptoms and the condition is known as HERPATIC
GINGIVOSTOMATITIS in which there is fever along with chills and malaise and there is formation of sores in mouth...
You should consult a physician and get him evaluated..
In case if the Viral Infection is diagnosed you should give him Tylenol or Motrin for pain relief..
Do cool compresses over gums for relief from Inflammation and reduction in swelling..
In case of pain in the sores on tongue a numbing gel like Oragel can be applied..
In severe cases
antiviral Oral and
topical Medication like
Acyclovir therapy is given to the patient to reduce the duration of illness...
Give him cool and bland diet..
Give him sufficient rest..
Maintain a good
Oral hygiene and brush his teeth twice a day using an ultra soft toothbrush..
Hope this information helps..
If you find the answer helpful please give me a Five Star Review and click on found the answer helpful as a token of appreciation...
Thanks and regards..
Dr.Honey Nandwani Arora..