Leukonychia is a condition where white spots appear on the nail. It is caused by air bubbles, a bruise, or other injury to the nail. It is found more commonly in nail biters and people who tap their nails on hard surfaces.
If you do have multiple spots on your nails, there could be a more serious medical condition brewing that you need to speak to a Physician about.
Otherwise, a spot here or there is normal and will grow out. Remember, it takes eight, yes eight weeks for complete nail re-growth. So be patient and soon enough it will be gone.
Reference, Milady's Standard Nail Technology 4th edition 2004
