Thank you for your query on Healthcare Magic.
It seems you developed a contusion
due to collection of blood in the scalp which is caused by the injury.
You can apply ice packs which will decrease the pain and swelling.
For pain you can take Tylenol
in prescribed dose every 8th hourly with food.
Watch for headache, vomitings, bleeding from nose or ears and report to emergency immediately if you have any these abnormal symptoms.
Consult the doctor for physical examination once to rule out any abnormal signs of brain injury
Hope I have answered your query.