It seems from the history that you had a injury to the front of the head following which you are having a bump on the fore head.This is because of collection of blood in the layers of the skin as a result of impact of trauma.
This will decrease over a period of 3-4 weeks and application of cold
compression provides symptomatic relief.
But since you are having complaint of nausea concussion head injury
needs to be ruled out, hence I advice you to consult your doctor for examination and treatment accordingly.