side effect and growth of fingernails

SINCE JANUARY 09 I'VE NOTICE THAT MY FINGERNAIL (POINTER) STARTED PEELING THE OTHER WAY UP TO WHERE THE FINGER STARTS.  THEN 3 MONTHS LATER ON THE SAME HAND THE THUMB, THE NAIL STARTED GROWING OUT LIKE A NEW NAIL IS COMING AND PUSHING THE OTHER ONE OUT.  RIGHT NOW THE POINTER NAIL IS ALMOST AT ITS FLESH WITH A THIN LAYER AND REALLY FLAT AND ROUGH;  THE THUMB WELL THE OLD NAIL IS HALF WAY AND I COULD LIFT THE END FROM WHERE IT STARTS GROWING AND RIGHT BEHIND IT IS A BIG BUMP(THE NEW NAIL) KIND OF LIKE PUSHING THE OLD ONE OUT.  COULD IT BE WHEN I WAS ON PREDNISONE?  IS THIS A SIDE EFFECT?  DOCTOR TOLD ME IT COULD BE BUT SHE WASN'T SURE.  OH AND IS NOT A FUNGI OR INFECTION.  ANSWERS PLEASE!!