It can sometimes happen that after laser surgery, there is some discoloration. If for example you were tanned, or if the laser was done at a setting that was too strong for your skin type, this can result in temporary white spots. If you have a darker skin type, this is a more common occurrence. Luckily it is often temporary and reversible. However it may last for a very long time and in rare circumstances can be permanent. The best thing to do would be to seek a consultation with a dermatologist. Good luck.