Bruises are common in an injury
and they will heal perfectly well may take time upto 15 days. But the concern is under the bruises you might have a fracture
of wrist bones as you can't move. So I will advise you to do one x ray
wrist AP and Lat view and let any physician see. If suppose no fracture take some painkillers like Diclofenac
in combination with serratopetidase (Seraton D)which will help to reduce the swelling.