What Causes Bruising And Large Black Area On Leg After An Accident ?

hello im concerned that my husband should go see a doctor but because he is laid off work with no insurance he refuses to listen. He is 50 years old and slightly overweight 6 0 230lbs. he was in a bike accident satuday and blunt force trama to his right leg from above his knee to his right hip. he states that there is no broken bones but he is bruised bad large area very black and blue in color. what risks are associated with these symptoms