I had a trauma fracture, 3 days ago, in the posterior wall of left maxillary sinus with an accumulation of blood, visible on ct. how serious is this?

See otolaryngologist: If the fluid from the trauma remains stagnant in the sinus, it can become infected and produce a sinus infection. An evaluation and necessary treatments by an ear, nose and throat doctor is important. In the meantime, a warm moist environment can help to break down the blood For that reason a warm shower with the water lightly hitting your face should begin to create a drainage of the blood.