Just first wash our face.and next close our eyes and sleep for sometime. Onething even i got ball hit on my face.but our sir suggest that after hitting also if we play we won't feel the pain.
I would tell him that not to play basket ball because he is al ready injured in this situation he cannot play basket ball. If he continuous to do that then he may be probably injured once again by a hit on to his face. I would suggest him not to play until he is well enough fit and fine to play any more. The boy should even be given with the first aid that if the hurt is more he can get a small help and then go to doctor for any more further help