The swelling & black discolouration is due to accumulation of fluid and blood (hematoma
The blood cells which gets accumulated are eventually broken down and absorbed in the body.
But this is a slow process & takes times to disappear completely.
Till that time, symptomatic relief is obtained by taking analgesics, ice compression & adequate rest.
However, if there is any hidden injury to the brain or minor intra-cranial bleeding, then it may take some time for the symptoms to develop.
So it is important to maintain caution for 1 week.
If the symptoms still persist or associated with any other complaints like dizziness
, loss of consciousness
, convulsions, etc., then it will be better to consult your Physician.
Investigations like X ray of the head & neck region and CT scan will be helpful to rule out any fracture
to the facial & cranial bones or any trauma to the brain.
There is no need to worry, you will be fine.
Wishing you a good health.
Thanks & take care.