Hello dear,
The bump behind the ear is due to accumulation of fluid or blood (
hematoma).
And the pain can be attributed to the inflammatory response due to the injury.
The pain and swelling will gradually decrease as the inflammatory response subsides.
But this is a slow process & takes times to disappear completely.
Till that time, symptomatic relief is obtained by giving analgesics, ice compression & adequate rest.
However, if the swelling still persists or associated with symptoms such as high grade fever,
vomiting,
dizziness,
loss of consciousness, convulsions, etc. then it will be better to consult a Neurophysician.
Investigations like X ray &
CT scan of the brain will be helpful to rule out any intra cranial pathology.
There is no need to worry, he will be fine.
Wishing him a good health.
Thanks & take care.
You can ask me a direct query on this website using the below link: http://www.healthcaremagic.com/doctors/dr-polash-sannigrahi/64925