It depends on what caused the swelling. Did you bump your forehead on something? Or is the skin just raised on its own? You could have a boil (like an infected pimple)..in that case, you can clean it well 2x a day with soap and water and an alcohol pad or peroxide. It is an infected pore, and that would help clean it and it should eventually go away. If not, see a doctor. On the other hand, if you bumped your head, you can put an ice pack on it, but if you have any dizziness or lightheadedness, etc, you better go to the emergency room and get it checked out because you may need further evaluation.
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