My 8 year old son was hit with a football on his penis two weeks ago. Since then he has been complaining of mild throbbing that happens for a few seconds 3 - 4 times a day, sometimes when he has passed urine, and even otherwise. His paediatrician had prescribed a local anasthesia that seemed to work. But after 3 days of stopping it, my son complained again. His foreskin does not retract.