Welcome to HealthcareMagic forum.
I empathize with you. Brain is well protected within a hard skull and it takes a real hard hit to cause concussion
/ bleeding in the brain. Moreover since you are asymptomatic (no headache, vomiting
or loss of consciousness
) you are safe and fine.
Bump felt at the site of injury
is collection of blood under the scalp. This occurs very commonly as this part of the area is highly vascular. This lump will disappear in a few days to a week.
In all probabilities you seem to be absolutely fine and safe; no obvious signs of internal bleeding
I suggest you to watch how you progress for a week or two. If the next couple of weeks pass off uneventfully, you need not worry about complications in future.
Hope this information suffices.