Potato juice will not cure acne scars. Potato juice will clean the skin, its enzymes acting as a natural antiseptic useful for killing off the bacteria which cause acne outbreaks. In this way potato juice will indeed cure acne, but not the scars untreated acne leaves behind. Once the damage has been done, the scars cannot be removed. This does not mean that potato juice is of no use to aid the skin in healing. What people do not realize is that, though the scars are there to stay, they can be lightened and shrunk, making them less visible. The majority of scar tissue visible to the naked eye is made up of dead skin.