A swelling and soreness is the natural outcome of a hard hit or a fall. The trauma of the impact is what causes the swelling of the tissue; it should go down in some time.
There is one thing that you should be very careful about. Since this is the forehead we are talking about, it is very possible that there may be an internal injury, may be a haemorrhage, that could result in something much more serious, e.g. an internal haemorrhage, a clot in the brain, or a cerebral stroke. That is serious stuff, and therefore the first thing you need to do is go to a doctor immediately and get a CT scan and an X-ray done to ensure nothing serious is going on inside as a result of the hit.
Simultaneously, you can apply an ice pack, though that should have been done much earlier, right after the hit. That would have been more effective than applying an ice pack a few hours after the incident. But as they say, better late than never!
There is one thing that you should be very careful about. Since this is the forehead we are talking about, it is very possible that there may be an internal injury, may be a haemorrhage, that could result in something much more serious, e.g. an internal haemorrhage, a clot in the brain, or a cerebral stroke. That is serious stuff, and therefore the first thing you need to do is go to a doctor immediately and get a CT scan and an X-ray done to ensure nothing serious is going on inside as a result of the hit.
Simultaneously, you can apply an ice pack, though that should have been done much earlier, right after the hit. That would have been more effective than applying an ice pack a few hours after the incident. But as they say, better late than never!