What are these on my hands and arm? Help! I need to know how to GET RID OF IT!!!

What are these? My mother told me it’s sun spots from when I travel .. I just want it gone. When I don’t put lotion on, this is how it looks , I’m a different color. Lol .. I’m just wondering how do I get rid of this , there has to be a way??

It is both of my hands and fingers as well

And it got on my arms.

My sister also has 3-4 spots on her forehead.

HELPPP!!! :(