Hi and welcome to HCM!
Thanks for posting your query here.
A blow on the nose resulting in bleeding is called as epistaxis
. This is due to the rupture of the blood vessels present on the anterolateral wall of the nose. Also chances of fracture
of the bridge bones are there. An x-ray of the nasal bones is recommended. If there is no fracture the swelling could be because of the collection of the blood or the inflammatory fluid. There are maximum chances of infection spreading to the brain through this area. Hence prompt drainage
of the collection and use of antibiotics is recommended. Please consult your ENT doc for further management.
Hope this is helpful to you.