Thanks for the query
If trauma is associated with loss of consciousness
that is uncertain or very brief( few seconds only), irritability( now resolved), behavioral changes if any, scalp
hematoma( particularly nonfrontal), the risk of clinically important traumatic brain injury
is approximately 1 percent for a child with at least one of these criteria.
If you notice any of the above mentioned symptoms or vomiting
even if it is delayed by several hours consult your doc as a neuroimaging
will be needed in that condition. No need to worry otherwise.
Apply Thrombophob gel over the area if there is any swelling.
I hope this answers your query well
Wish you and your family good health