A great natural acne scar face mask I found that worked for me is a face mask made from cucumber's and yogurt.
Take a cucumber and then peel the skin off the cucumber then puree the cucumber and add a tablespoon of yogurt to the cucumber puree then apply this cucumber puree to your face and leave it on your face for around 15 to 20 minutes to remove the acne.
Then after 15 or 20 minutes you can rinse the face mask off your face.