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From the details provided it looks like he has only scalp injury
(hematoma) and nothing to suggest an internal brain injury
. Seizures are likely to increase after injuries for various reasons. If you feel that he is getting new types of seizures after head injury
then he needs evaluation to rule out the possibility of internal injury.
If the injury was due to drop attack (sudden flexion of the head and abrupt falls) then we need to consider using protective head gear for preventing further falls and head injuries. For more information contact your epilepsy
Dr Shiva Kumar R