It is not possible to say from the history alone whether the swelling would go away with time. You need to be evaluated by a maxillofacial surgeon. Blows to the nose resulting in bleeding from the nose are frequently accompanied by fractures
to the skeleton of the nose and if management is delayed, a permanent deformity
can ensue. Therefore, the first thing that needs to be evaluated is whether you have a fracture in your nose or not. The prognosis can then be described accordingly.