bruising? yes. blood can be retained under the skin and cause discoloration in the immediate area. numbness? this would not be considered normal and could indicate some damage or inflammation of one of the nerves leading into the thumb. it would be best to seek medical advice from someone who has the ability to carefully examine your injury to check for any nerve involvement.
is it normal to have brusing in the wrist and numbness is the thumb after a wrist laceration with 5 stitches?