I think these white patches are vitiligo(Витилиго). If you want to check eithor these what patches are vitiligo (Витилиго)or some other thing. here are some info about the symptoms of vitiligo(Витилиго).
The most important symptom of vitiligo (Витилиго) s usually the appearance of a light colored patch in the skin, referred to as de-pigmentation.
The skin in vitiligo patches is usually sensitive to sun (photo sensitivity) and sun burns are common.

you can also try the "Wood Lamp Experiment" to know.

Last an important tip is visit the site http://www.antivitiligo.com/
Here you will found the Images of different vitilig people if your whit spot are resemble with the images of that people spot than think otherwise these are not vitiligo fell normal and take a nice sleep