Not really, you can get this after it has had white spot, the flakes will go away within 5 days, kee p an eye on it, if it get much worse then speak to someone at your LFS or post a pic.
It looks like grains of salt and quite alot but i have other platy and they dont seem to have it and they came from the same tank i dont know if this will help but i fink it might be pregant
To post a pic go to: www.imageshack.us They can host it for you and your pictures can be biggrer.
The spots on my fish was on the tail and one on the head area.