Take a small fresh lemon and squeeze out its content juice. Apply the juice directly on the scars using the finger tips or a clean cotton ball, leave it for about 10 minutes and wash it off using cold water. Do this at least once a day for about two to three weeks during after which you can see the scars disappear considerably. If you want, you can also mix some honey with the lemon juice to make it some more effective in reducing of the acne scars.
Acne (acne vulgaris, common acne) is a disease of the hair follicles of the face, chest, and back that affects almost all teenagers during puberty -- the only exception being members of a few primitive Neolithic tribes living in isolation. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s.