You bumped your head how long do the bumps usually last swollen on forehead been about 36 hours and it gone down too much. Should you call doctor?

If the swelling from a head injury hasn't gone down after 36 hours, you should contact your doctor. Additionally, if the swelling feels warm, tender, or is accompanied by other symptoms such as headaches, nausea, vomiting, confusion, or changes in vision, you should seek medical attention immediately.