Dear evelyn1953,
I would recommend that he seek the care of an eyeMD. It is possible that a blood vessel has bled or he has an injury elsewhere. Eye rubbing, straining, aspirin or nonsteroidal anti-inflammatory medications may reduce clotting time or bleeding.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California