The white pustules are much finer and are located mainly on the body. It is a little easier to cure than Ich, since the life cycle is not so rapid. It commonly follows chilling or stress caused by transportation or poor water quality. Pick the visible parasites from the fish. Follow with commercially available treatment such as Aquatronic's Diacide or CopperSafe by Mardel Laboratories.
Parasitic infestation is perhaps the easiest to diagnose.
The fish must be removed from the tank while the parasite is removed. Follow up treatment is essential to prevent fungal or bacterial growth.