Few white spots actually in focus in those photos but, given no other useful information, I suspect scale insects.
Can the spots be scraped off the leaves?
If you squash the larger spots is there any 'juice' under them?
As mentioned, additional information can usually help make IDs easier and more accurate.
Some things to include:
Tree species - The tree appears to be a ficus?
Your location - many pests are more common in some parts of the world and not present in other areas. Location can help eliminate some possibilities. Treatment options might also vary depending on location so your location can be important info.
