Make a homemade face mask by mixing a tablespoon of yogurt, oatmeal and sour cream. Add a few drops of lemon juice and apply the mixture on your face and neck. Rinse it off after 15 minutes or so. Do on a regular basis to reduce acne scars. Read on from health.howstuffworks.com/skin-care/problems/treating/get-rid-of-acne-scars2.htm.