Spots on fēnix 5 sapphire glass

Hi,

I noticed some small spots on the sapphire display of my Fenix 5x. It is not possible to wipe them off.

Do you may know what that could be?

Pictures of my Fenix 5x Sapphire with small dots (the big bright one is a reflection of a lamp). It is not that easy to catch the dots on a photo.

I tried to wipe them off with a eyeglass cleaning cloth - no success.