thank you for your query.
Yes a fever
can be a sign of a concussion
The common symptoms of concussion in children are-
,vomitting,irritability,loss of balance and change in eating patterns,fever.
The American Academy of Pediatrics recommends that you call your child's doctor for advice if your child receives anything more than a light bump on the head. If your child remains alert, moves normally and responds to you, the injury is probably mild and usually doesn't need further testing.
-Look to see if pupils are the relatively the same size. If the pupils don't respond or one pupil is huge and doesn't respond that is a sign of a brain injury
-Also feel the skull for holes in the skull.
-If there is a soft spot the skull is fractured.
fever is an emergency symptom of concussion,hence i would advise you to consult a peadiatrician once to start medication.
he would advise for X-ray or a CT to look for bleed and fracture and complete blood picture to look for any infection.
the earlier the medication is started the better.
wishing you good health