REN dark spot sleeping cream??

[listsandbudgets]

I got a jar of this in one of the advent calendars.

I'm a little bit confused about how to use it.

Do I use it on all of my face or just on spots I'm concerned about. Can I use it instead of moisturiser or do I need some of that on top?

Thanks for any help

PM: Gently massage a generous amount onto a freshly cleansed face and neck until absorbed.

Thank you