Hello and welcome to HCM. Thanks for you query.
As per your history it seems like hematoma
( i.e. collection of blood underneath the skin) formation at the site of impact on your head.
You continue keeping cold packs to reduce the swelling and take pain killers.
Usually it takes 8 to 10 days for a hematoma to comes down. In case it does not come down beyond that period you consult your doctor.
Sometimes hematoma gets infected and in such cases you will have fever, chills and increased pain at the swelling site.
In case if you have any of the below mentioned symptoms you have to seek medical help
as early as possible - nausea
, loss of consciousness
, loss of memory, weakness in any part of the body, convulsions, bleeding from ears/nose,