Usually when head injuries are not that severe, we ask the patient to monitor himself for any signs and symptoms of severe head injury with in the first 24 hrs such as severe headache, nausea and vomitings and weakness/numbness of the whole body.. When no such symptoms occurred and if the patient condition didn't deteriorate, we usually do not need to do further investigations/imaging.. But as you say you feel numbness in your face, it seems to be a local injury.. And hopefully not a serious one... Most likely because of the edema due to impact.
Next Steps
As the incident occurred two days and as you don't complain the above symptoms, any severe injuries are less likely... You can still consult an orthopedic doctor to physically examine you and rule out all other injuries. Hope this is helpful